Ernest Rutherford's atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick's discovery change the atomic model? A. The new model showed a negatively charged nucleus. B. The new model showed

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  1. science

    The modern atomic model includes electrons orbiting the nucleus. Which of the following parts of Dalton's atomic model was disproved by the discovery of the electron? - Atoms are tiny particles. - Atoms cannot be divided into smaller parts . - Atoms have

  2. Science--HELP!!

    Can you please check my answers: 1. Dalton's idea that atoms cannot be divided into smaller parts was disproved by the discovery of _________ (electrons?) 2. The description of the structure of the atom is called ______ (atomic model?) 3. In a water

  3. Physics

    In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current

  4. Chemistry

    What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11? (1) 11+ (2) 12+ (3) 23+ (4) 34+ How do you figure this out? Would the answer be (1) 11+ since the atomic number is 11 and atomic #=protons which are positive??

  5. Science

    The Composition of Atoms Quick Check questions and answers Science 8 A Unit 3: Matter Interactions A. A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level? 1. four in the

  6. PHY science

    Which argument best explains the charge of an atomic nucleus? (1 point) An atomic nucleus is positively charged because it is composed of neutrons * An atomic nucleus is positively charged because it is composed of protons. An atomic nucleus is negatively

  7. Urgent- Science

    Dalton theorized that matter is made of tiny, indivisible particles called atoms. In what way did the theories of each of these scientists support or differ from Dalton’s theory? K/U (a) J. J. Thomson (b) Ernest Rutherford (c) James Chadwick

  8. Physics PLEASE HELP

    Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei (4He) from gold-197 nuclei (197Au). The energy of the incoming helium nucleus was 7.58

  9. science

    1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms

  10. science

    HELP ME !!!!!!! What is the atomic number of an atom?(1 point) the number of particles in the nucleus the number of protons the number of neutrons the number of particles outside the nucleus Which statement about an atom is correct?(1 point) The proton has

  11. Science!

    Ernest Rutherford's atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick's discovery change the atomic model? A. The new model showed a negatively charged nucleus. B.

  12. Science 1 easy question!!!!

    One way the modern atomic model differs from Thomsons atomic model is that electrons are no longer scattered throughout an atoms positive matter like chocolate chips in cookie dough, instead each electron is outside of the nucleus occupying a specific

  13. Chemistry

    Which of the following are key parts of Dalton's Atomic Theory (Click the 4 that apply)? (1 point) All elements are composed of tiny indivisible particles called atoms*** Atoms of the same element are identical. The atoms of any one element are different

  14. science.

    Protons are positively charged and repel other protons. Which other particle is found in the nucleus and separates protons so that the strong force can hold the nucleus together? A) electrons B) neutrons C) protons D) quarks please help cause i'm genuinely

  15. Science

    1. Which statement about subatomic particles is NOT true? (1 point) Protons and neutrons have almost the same mass. Protons and electrons have opposite charges. Unlike protons and electrons, neutrons have no charge. Protons and neutrons have the same

  16. Science

    1. Which of the following best describes an atom? A) protons and electrons grouped together in a random pattern B) protons and electrons grouped together in an alternating pattern C) a core of protons and neutrons surrounded by electrons* D) a core of

  17. science help

    What would happen to the current model of the atom if new information about its structure is discovered in the future? A. The current atomic model would be revised. B. The current atomic model would be strengthened. C. The current atomic model would be

  18. Physical science CHECK my answers

    1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom*** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron***** 3. Who provided the first evidence that

  19. Science

    What is the difference between Thomson's Plum pudding Model and Rutherford's Atomic model of scattering

  20. Chemistry

    I need to write this into its atomic symbol. the isotope with 7 protons and 8 neutrons in its nucleus. I don't really understand it the whole protons and neutrons thing so if you could clear that up for me also it would help. Thanks :D

  21. Biology

    J.J. Thomson's experiments supported the existence of a particle that deflected away from a negative charge and toward a positive charge. Ernest Rutherford found that when positive particles were fired at gold foil, some of the particles deflected rather

  22. physics

    Rutherford fired a beam of alpha particles (helium nuclei) at a thin sheet of gold. An alpha particle was observed to be deflected by 90.0°; its speed was unchanged. The alpha particles used in the experiment had an initial speed of 2.2 ✕ 10^7 m/s and a

  23. Science--Help.

    Which of the following is NOT one of the eight most common elements in Earth’s continental crust? carbon silicon oxygen aluminum The most abundant element in Earth’s continental crust (by weight) is _____. 2. oxygen silicon calcium iron 3. The central

  24. Science

    18. The description of the structure of the atom is called the ___. ATOMIC MODEL 19. In a water molecule, two atoms of hydrogen and one atom of oxygen share electrons. A ______ bond is found in a water molecule. COVALENT BOND 20. Sodium chloride is formed

  25. science

    Rutherford used his gold foil experiment as evidence for a new atomic model. He suggested that the atom contained a small positively charged nulceus surrounded by a large void filled with only a few electrons orbiting the nucleus. What other experiment or

  26. phisycal sciences

    Which of the following properties did Rutherford use in his experiment? A. the negative charge of the alpha particles and the random distribution of protons B. the negative charge of the alpha particles and the positive charge of the gold foil C. the

  27. Chemistry

    What limitations might an atomic model have in properly illustrating the structure of an atom? An atomic model cannot be used to represent the relative number of each subatomic particle within a specific atom. An atomic model helps with calculations to

  28. Science

    What describes the current model of the atom? A)That electrons and protons move randomly around a nucleus. B)Electrons travel as waves in the electron cloud that surrounds the nucleus. C)Electrons orbit the nucleus like planets orbit the sun. D)Protons

  29. physical

    In1911 ernest rutherford

  30. Science

    Use the following words to fill in the blanks. Atomic number Ionic bond Atomic mass Law of conservation of mass Endothermic reaction Electron Covalent bond Product Isotope Proton Carbon cycle Energy level, orbital, or shell Atomic model Atomic theory 1.

  31. science

    what is the charge on a copper nucleus The atomic number is the number of protons in the nucleus and protons have a charge of +1. What is the atomic number of copper? Look on the periodic table. If you don't have one at home, here is one on the web.

  32. chemistry

    the number of protons in the nucleus of an atom is called the.... atomic number

  33. physics

    Which of the following summarizes Rutherford's model of the atom? Choose one answer. a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the

  34. physics

    The number of electrons that move about the nucleus of an electrically neutral atom is the same as the number of ____________________. A) protons in the nucleus.B) quarks in the nucleus.C) protons + neutrons in the nucleus.D) neutrons in the nucleus.E)

  35. physics

    Does anyone know what this is about? please help I would be more than grateful.. How does Rutherford’s model of the atom account for the back – scattering of alpha particles directed at the gold leaf

  36. pyhsical sciencve

    In Rutherford's gold foil experiment the alpha particles pass through which part of the atom? A. the nucleus B. the proton shield C. the valence electron shell D. the electron cloud

  37. Science

    What is the atomic number of an atom?(1 point) A. the number of particles outside the nucleus B. the number of particles in the nucleus C. the number of neutrons D. the number of protons Which statement about an atom is correct?(1 point) A. The neutron has

  38. Science

    Unit 3 Test Multiple Choice Please select the correct response for the following questions. 1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point)

  39. Physics

    Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.6 million electron volts, a charge of +2e, and a mass of about four AMU (one Atomic Mass Unit is 1.66 x 10-27 kg.

  40. Chemistryy

    Identify the observations of Ernest Rutherford's experiment with the gold foil. Where he experimented on alpha particles and deflection. Check all that apply.... 1) a positive charge is spread equally over the atom 2) THE MAJORity of the space inside the

  41. physics

    In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far

  42. physics

    In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 10-27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the

  43. Physics

    The size of Rutherford's atom is about 0.1 nm. (a) Calculate the attractive electrostatic force between an electron and a proton at that distance. (b) Calculate the electrostatic potential energy of that atom. Express the result in unit eV. (c) The size of

  44. science

    One way the modern atomic model differs from Thomson’s atomic model is that electrons are no longer scattered throughout an atom’s positive matter like chocolate chips in cookie dough. Instead, each electron is outside of the nucleus occupying a

  45. science

    Protons are positively charged and repel other protons. Which other particle is found in the nucleus and separates protons so that the strong force can hold the nucleus together? A) electrons B) neutrons C) protons D) quarks

  46. Chem

    The atomic numbers and masses must added up on both sides of the equation just as we must have the same number of atoms on each side of an equation when it is balanced. Ejection of a "thing" with 2 protons and 2 nuetrons is a He nucleus which is an alpha

  47. Chemistry

    What would have happened if Rutherford shot negative particles instead of positive particles in his gold-foil experiment? What would have happened if the nucleus in the gold-foil was actually negative, rather than positive, in his experiment?

  48. physics

    The number of electrons that move about the nucleus of an electrically neutral atom is the same as the number of ____________________. A) protons in the nucleus.B) quarks in the nucleus.C) protons + neutrons in the nucleus.D) neutrons in the nucleus.E)

  49. Chemistry

    Identify the element shown below. Group of answer choices Magnesium (Mg) Hydrogen (H) You cannot identify the element, there is not enough information. Helium (He) Calcium (Ca) Flag this Question Question 26.67 pts A student tests an unknown substance for

  50. Physics

    A neutron causes the element 88X232 to change according to the reaction 0n1 + 88X232 ---->ZYA + . Identify the (a) atomic number and (b) atomic mass number of the daughter nucleus. (c) This product subsequently undergoes - decay, and its daughter does too.

  51. Science

    Why does my hair stand on end when I take off my hat on a cold, dry day? Everything you see is made up of atoms. They contain even smaller particles, called protons and electrons. Protons have positive electrical charges and they never move. Electrons have

  52. Chemistry-History-ish

    Describe 3 experiments, run prior to 1930, and the types of energies/particles used to probe the structure of the atom. What did each experiment investigate? Include the names of the scientists associated with each experiment in your answer Would this be

  53. Physics

    Ernest Rutherford fired alpha particles (helium nuclei) at a sheet of gold foil rolled as thin as he could get it. Some of these particles passed straight through the foil, some bounced off at various angles, and some rebounded directly backwards. From

  54. Check my answers, Physical science

    my answer has the **** 1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom***** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron*** 3. Who provided

  55. CHECK answers science

    my answer has the **** 1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom***** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron*** 3. Who provided

  56. physics

    Ok, let's use the following information to very roughly estimate the size of the nucleus. Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.70 million electron volts,

  57. physics

    Ok, let's use the following information to very roughly estimate the size of the nucleus. Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.70 million electron volts,

  58. science

    I'm doing Science right now. I have the answers down for most of them but I'm not sure if I am right..... Can u pls help me and tell me if my answers r right? I suck at science :S 1.A 2.C 3.B 4.D 5.D 6.A 7.? 8.A 9.E 10.C 11.A 12.D 13.C 14.B 15.? 16.? 17.?

  59. science

    When a parent radioactive nucleus splits by ejecting an alpha particles (two protons and two netutrons), the remaining nucleus has ____ the original nucleus. a) two protons and two neutrons more than b) two protons more and two neutrons less than c) two

  60. Science-Periodic Table

    whats the connection/relationship between the # of protons in the nucleus of an atom & and atomic # of the element? The atomic number tells you the number of protons in the nucleus of the atom. The atomic number is the number of protons in the nucleus of

  61. Chemistry

    Can you please help me figure out this fill in the blank? Okay here it goes: Neils Bohr stated the structure was similar to the _________________ of our galaxy. and the other is: The Rutherford experiment led tot the discovery of the ___________. Thank

  62. Science

    Daltons idea that atoms cannot be divided into smaller parts was was disproved by the discovery of______? The description of the structure of the atom is called the________? In a water molecule, two atoms of hydrogen and one atom of oxygen shared

  63. chemistry

    1. name the three fundamental particles present in an atom? mention the masses of the particles in M.K.S. system? 2.what is a proton? stste its relative mass and charge? 3.how many times a proton is heavier than an electron? 4.what important information

  64. Physical Science

    Please just help with these few! Also, these are my answers. Which statement accurately describes how electrons are arranged in Bohr's atomic model? electrons travel randomly in the large space outside the nucleus electrons travel around the nucleus in

  65. Science - Chemistry

    1. Dalton's idea that atoms cannot be divided into smaller parts was disproved by the discovery of the ____. 2. The description of the structure of the atom is called the ___. 3. In a water molecule, two atoms of hydrogen and one atom of oxygen share

  66. chemistry

    the particles protons and neutrons present in atomic nucleus are known as......

  67. Elements

    Which elements result if two protons and two neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226? What element is atomic number 86 and mass 222? Sorry, should be atomic number 88. Huh? It ejected two protons, changing the

  68. Chemistry Subatomic particles

    Fill in the chart (Numbers correspond to each other[I.E 1 in 1st group connects with 1in 2nd]) Subatomic particle found 1.Proton 2.Neutron 3.Electron Scientist 1.Rutherford 2.Chadwick 3.Thomson Experiment 1.Gold Foil Experiment? 2.? 3.Cathode Ray Tube Data

  69. science Help 911!!

    One way the modern atomic model differs from Thompson's atomic model is that electrons are no longer scattered throughout an atoms positive matter like chocolate chips in cookie dough. Instead, each electron is outside of the nucleus occupying a

  70. science dr bob

    I thought i was done but I am confused on these two. 1. In a natom electrons are located in energy levels that are a certain distance from the nucleus. I put rutherford. and I am still left with atoms are small hard particles - wave - rutherford -democrius

  71. chemistryI

    If 2 protons and 2 neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226 which element will be the result? Could someone please tell me how to work this out. Thanks. The atomic number is the count of protons...so if two are

  72. Chemistry

    Right. So, I've been putting this question off from my review... I just attacked it with google to no avail. My books have been no help. Which is FALSE? a. If JJ Thomson's model for the atom were correct, alpha particles would be only slightly deflected

  73. science

    hey i need help with this question i appreciate it! Which statement best describes Rutherford’s model of the atom? A. It is like an avocado with the pit representing the nucleus. B. It is like an aquarium with swimming fish representing positive charges.

  74. Chemistry

    Will someone please help me? I had a question and i answered it, but i coudn't draw a picture for it. Can some help me draw a picture for it or tell me how to draw it step by step. Thank you. The nucleus is made up of protons and neutrons. Protons and

  75. S103

    Which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226 - show workings? What is actually ejected is an alpha particle (helium nucleus). The new atomic number is 88-2 = 86 and the new

  76. Science

    The modern atomic model includes electrons orbiting the nucleus. Which of the following parts of Dalton’s atomic model was disproved by the discovery of the electron? A. Atoms are tiny particles. B. Atoms cannot be divided into smaller parts. C. Atoms

  77. Physical Science

    .In the early 1900s, two associates of New Zealander Ernest Rutherford bombarded thin sheets of gold with positively charged subatomic particles. They found that most of the particles passed right through the sheets but some bounced back as if they had hit

  78. science

    an atom is made of a positively charged nucleus surrounded by a large region in whci hscientists can predict where an electron is likey to be found. I think this is attributed to rutherford choices are: rutherford, wave model, thompson, dalton or bohr.

  79. Physics

    The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) What is the force between the two alpha particles when they

  80. Physics

    In a location in outer space far from all other objects, a nucleus whose mass is 3.57232e-25 kg and which is initially at rest undergoes spontaneous "alpha" decay. The original nucleus disappears, and two new particles appear: a He-4 nucleus of mass

  81. Final Exam- Honors Physical Science

    how can you determine the number of protons, electrons,neutrons, atomic number, and the atomic mass of an element using the periodic table? Atomic mass is given in the table, as well as the atomic number and atomic mass number. Atomic number is the number

  82. Physics

    Which of the following summarizes Rutherford's model of the atom? a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the nucleus like

  83. Science 7th Grade

    How do i solve this. Atomic Theory Date (year) Name of Scientist(s) Contribution to the Theory Source 5th century BC Leucippus and Democritus They proposed that all matter is composed of tiny particles called atoms that can’t be split into smaller pieces

  84. Physics

    I need help with question one and I need question three to be checked please? 1.How does the mass of a nucleon compare with the mass of an electron? 3.Why do protons in a very large nucleus have a greater chance of flying apart by electrical repulsion? -I

  85. Chemistry

    What specific evidence from the gold foil experiement led Rutherford to come to each of the following conclusions? The nucleus occupies very little space in the atom. Answer:He shot alpha particles through thin sheet of gold and discovered some were

  86. chemistry

    summarized the atomic structure and discovery of nucleus and protons

  87. Physics

    Two protons in an atomic nucleus repel each other, but they are also attracted to each other. Explain.

  88. chemistry

    which pairing below does not correctly match the scientist with the contribution to the understanding of the atom A. Proust and the realization that the elements of compounds are found in certain proportions by mass B. Thomson and the law of definite

  89. chemistry

    which pairing below does not correctly match the scientist with the contribution to the understanding of the atom A. Proust and the realization that the elements of compounds are found in certain proportions by mass B. Thomson and the law of definite

  90. Chemistry

    When did these scientists make their contributions ? The years Democritus believes that the universe was made of tiny uncuttable particles. Heisenberg works with the Quantum Theory Chadwick finds the missing mass of the atoms nucleus Dalton's believes that

  91. Physics

    How does Rutherford's model of the atom account for the back-scattering of alpha particles directed at the gold foil?

  92. Science

    The modern atomic model includes electrons orbiting the nuclear us which of the following parts of daltons atomic model was disapproved by the discovery of the electron? Adams are tiny particles atoms cannot be divided into smaller parts atoms have

  93. answer check science

    1. Which type of metal did Rutherford shoot alpha particles into? A)Copper B)Zinc C)Gold D)Platinum 2.When Thomson held a positively charged plate near the cathode ray, the beam bent toward the plate. What conclusion can be drawn from this observation?

  94. science

    1. Which type of metal did Rutherford shoot alpha particles into? A)Copper B)Zinc C)Gold D)Platinum 2.When Thomson held a positively charged plate near the cathode ray, the beam bent toward the plate. What conclusion can be drawn from this observation?

  95. What did James Chadwick discover?

    What did James Chadwick discover?

  96. Chemistry

    Neutrons are more effective than protons or alpha particles for bombarding atomic nuclei. Why?

  97. physics

    Which of the following is correct according to Rutherford's atom model? Choose one answer. a. Atomic spectra should be line spectra. b. Electrons do not radiate while revolving in an orbit. c. Atomic spectra should be continuous spectra. d. Electrons are

  98. chemistry

    In an atom, there is a force that holds the protons & neutrons in the nucleus. Is this force called the nuclear force? What about the force of attraction between the nucleus and electrons? Is is called the electrostatic force of attraction?

  99. chemistry

    Lithium-6 has an atomic number of 3. How many protons are in this isotope? A. 0 protons B. 3 protons C. 6 protons D. 9 protons I think 3

  100. physics

    What is the magnitude of the electrostatic force that the two protons inside the nucleus of a helium atom exert on each other? Why do atomic nuclei not simply explode?

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