1. Chemistry

    How many d electrons are there in MnO4-? please explain.

    asked by Bob on May 18, 2011
  2. Chemistry

    How many valence electrons does phosphourous have

    asked by Lauren on November 18, 2007
  3. Chemistry

    How many valence electrons are in Na then in the 1+ion of Na?

    asked by Camilla on November 12, 2011
  4. Chemistry

    how many electrons are in 3.70 x 10^23 atoms of carbon 13?

    asked by Emily on September 16, 2010
  5. Chemistry

    How many valance electrons are there in [(C2H5)4N]+ ?

    asked by Brian on March 14, 2013
  6. chemistry

    How many valence electrons are there in BrF3?

    asked by Jenny on October 2, 2009
  7. Biology

    What is the path that electrons take in C3 photosynthesis?

    asked by Anon on February 21, 2017
  8. science

    can you give me a websight on electrons.

    asked by Stanly 6th grade on February 15, 2011
  9. chemistry

    Are Si valence electrons shared? Are C valence electrons shared? please help

    asked by lydia on September 1, 2017
  10. Chem

    Why are electrons paired in orbits?

    asked by Lena on September 21, 2009
  11. chemistry

    what ion has 12 protons and 10 electrons?

    asked by abby road on February 3, 2010
  12. science

    how many electrons at most can occupy a given orbital?

    asked by mic on October 18, 2010
  13. science

    how many valance electrons do Bromine have

    asked by Frike on September 27, 2008
  14. Physical Science

    If element X has 81 protons, how many electrons does it have?

    asked by Emma on January 11, 2017
  15. science

    how many electrons are in the sodium sulphate?

    asked by jailos on January 31, 2016
  16. Chemistry

    How many protons, nuetrons, and electrons are in 18 2- O 8

    asked by Meg on March 31, 2010
  17. chemistry

    which element would have 2 electrons and +1 charge which element would have 18 electrons and +3 charge.

    asked by hadley on February 9, 2012
  18. chemistry

    How many electrons are actually in the composite band for Fe ?

    asked by Anonymous on October 12, 2008
  19. Science

    where are electrons located on an atom?

    asked by JACKSON on December 12, 2012
  20. Math

    A boat sails 40km from point A to point B, east of A on a lake. Lodge P is south of point A. Another lodge Q is south of point B. The bearing of Q from point A is S52degresE and the bearing of P from B is S39degresW. If P is 60km from Q, calculate the

    asked by Christopher on July 12, 2014
  21. physics

    Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 10-5 rev/sec.

    asked by qay on December 4, 2010
  22. physics

    Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and ùE = 1.157 x 10-5 rev/sec.

    asked by Qay on December 4, 2010
  23. Physics

    Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. Do I use the formula U=GMm/r G=6.67*10^-11 M=2.5*10^24 m=5 r=41000 Is this sort of right, any help would be greatly appreciated.

    asked by James on March 30, 2009
  24. physics

    If Earth shrinks in size such that its shape and mass remain the same, but the radius decreases to 0.21 times its original value, find the acceleration due to gravity on its surface. (6378.1/0.21)(9.80) = 2.97 m/s^2

    asked by Jon on April 3, 2008
  25. physics repost

    If Earth shrinks in size such that its shape and mass remain the same, but the radius decreases to 0.21 times its original value, find the acceleration due to gravity on its surface. (6378.1/0.21)(9.80) = 2.97 m/s^2

    asked by Jon on April 3, 2008
  26. Physics

    Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. Do I use the formula U=GMm/r G=6.67*10^-11 M=2.5*10^24 m=5 r=41000 Is this sort of right, any help would be greatly appreciated.

    asked by James on March 30, 2009
  27. social studies

    What are some resources that countries in the North have. Please LIST the resources. DON'T give me any sites. I tried to find some resources but I couldn't. Please help me. THANKS!:):):):):):):):):):):):):):)

    asked by rakhi on May 22, 2010
  28. My last three questions. please.

    opposition to the constitution came from substantial majorities in which of the following three states populous states? A) North Carolina, Virginia and Pennsylvania b) Virginia, Massachusetts, New York c) Massachusetts, pennsylvania, georgia d) North

    asked by Anyone who is good in history? on March 22, 2013
  29. chemistry

    Why is there a decrease in electron affinity going from lithium to sodium? A. There is a stronger nuclear charge, with no additional shielding electrons or number of shells. B. There are fewer spaces in the valence shell in which to place the added

    asked by Morgan on February 18, 2015
  30. physics

    A person walks 25.0 North of East for 3.80 km. How far would the person walk due North and due East to the same location?

    asked by sheila on September 25, 2009
  31. Physics

    (a)Assuming that only gravity is acting on it, how far does an electron have to be from a proton so that its acceleration is the same as that of a freely falling object at the Earth’s surface? (b)Suppose the Earth were made up only of protons but had the

    asked by Brian on July 29, 2010
  32. Science

    According to science, the fastest speed posssible for anything is the speed of light. The speed of light is about 186,000 mies per second. That means that in one minute, lighttravels 11,160,000 miles. The star nearest Earth is the Sun. It's about

    asked by Rafi on July 8, 2012
  33. Math

    A geosynchronous equatorial orbiting satellite orbits 22,300 miles above the equator of Earth. It completes one full revolution each 24 hours. Assume Earth's radius is 3960 miles. a. How far will the GEO satellite travel in one day? b. What is the

    asked by Mike on November 18, 2007
  34. Economics

    The South African government is not providing enough welfare of subsidies to the poor and underpriviledged. -What are welfare payments or consumer subsidies? -What is the South African govornment providing and to whom? -What are the costs and consequences

    asked by Sphesihle Mthethwa on March 14, 2014
  35. Chem

    so I have a set of fill in the blanks for symbol, atomic number, mass number, protons, neutrons electrons and charge. Protons: 6 Neutrons: 8 Electrons: 2 I said the atomic number was 6, the mass number was 12, and the charge was +4. The only thing I was

    asked by Em on May 28, 2009
  36. history

    Is it because of James Madisons urging, the election of 1800 was finally settled? or was it someone else? Election of 1800 Connecticut, Delaware, Georgia, Kentucky, Maryland, Massachusetts, New Hampshire New Jersey, New York, North Carolina, Pennsylvania,

    asked by Mack on April 26, 2007
  37. physics

    The force of gravity on a box is 597 N on the surface of the Earth. Find the mass of the box.

    asked by Nicholis on October 15, 2015
  38. us history

    I'm doing a mock trial defending Andrew Jackson being impeached. He is being indicted for violating states' rights in his dealings with South Carolina in the nullification crisis. I'm finding it extremely hard to find any info to form reasons to defend

    asked by Michelle on November 7, 2010
  39. Physics

    While following the directions on a treasure map, a pirate walks 36.6 m north, then turns and walks 6.3 m east. A.) What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure? Answer in units of m.

    asked by Luke on November 8, 2012
  40. physics

    Goku wants to visit Andromaeda galaxy which is 2 million light years away from earth. If it takes 30 years in the frame of the spaceship to travel to Andromeda from earth, what should be the speed of the spaceship? Assume that the spaceship travels at

    asked by Kitty on November 10, 2015
  41. Physics

    A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4  106 m, mass = 6.0  1024 kg)

    asked by Annie on November 19, 2012
  42. astronomy

    A body has four times the mass of the Earth but its radius is two times larger. What is the acceleration of gravity on the surface of this planet? If you were on this planet, should you be able to jump (on average) farther distances, shorter distances or

    asked by Gail on March 6, 2012
  43. physics

    A satellite moves in a circular orbit around Earth at a speed of 4390 m/s. (a) Determine the satellite's altitude above the surface of Earth. m (b) Determine the period of the satellite's orbit. h am I supposed to use rotational equations for this? I don't

    asked by Kelsey on April 7, 2010
  44. 5th grade

    one light year is about 9 trillion kilometers . arctus is a star that is 37 light years from earth.if you are 11 years old now,how old will you be when light that is leaving arcturus today reaches earth. how far in kilometers willit have traveled .sow your

    asked by cheyenne on April 25, 2010
  45. physics

    A conducting spherical shell with a total charge of +12.6 micro-coulombs has a point charge of -3.6 micro-coulombs placed at its center. The negative point charge will push the electrons in the spherical shell away from it. This will leave the inner shell

    asked by Mandaleigh on February 10, 2012
  46. Science

    1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates A. drinking water. B. smog. C. pesticides. D. acid rain. D? 2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes.

    asked by Beatrice on January 30, 2014
  47. Chemistry

    A gas in a discharge tube consists entirely of ions of the same element, of the same charge. Each ion has only one remaining electron. The voltage between the electrodes of the gas discharge tube is increased from zero. Electrons are accelerated across the

    asked by Chemq on March 25, 2013
  48. Physics

    How far above the surface of the Earth does an object have to be in order for it to have a weight which is 0.53 times the same weight as it would have on the surface of the Moon? (Ignore any effects from the Earth's gravity for the object on the Moon's

    asked by Lucy on February 9, 2012
  49. Physics

    A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west,and the acceleration of the car has componets of 2.4 m/s^2 east and 1.8m/s^2 south. Find the total displacement of the object (from t=0 to 25)

    asked by Alex on October 16, 2012
  50. ionic compounds!

    why are ionic compounds abundant in nature? Betty, I don't know how to answer your question. Abundant compared to what? How is abundant defined? I would think there are more covalent compounds in nature than ionic compounds but I may be wrong. Can you

    asked by betty on June 17, 2006
  51. Physics

    Find tha schwarzschild radius of tha earth ,whose mass 5.98×10^24kg

    asked by M salman on October 16, 2018
  52. Physics

    The mass of an astronaut is 72kg. (a) what is his weight on earth ( taking g to be 10N/kg) ? (b) if the astronaut is on the moon's surface where the acceleration due to gravity is one-sixth on the earth , calculate (I) the mass (ii) the weight of the

    asked by Lina on June 2, 2011
  53. physics

    if the angular speed of earth becomes 17times its present value what will be the 1.effect on a body on the equator of earth? it will be A. Heavier than present value B.lighter than present value C.weightless And also what is the reason? 2.a girl sitting on

    asked by edward on March 1, 2013
  54. physics

    if the angular speed of earth becomes 17times its present value what will be the 1.effect on a body on the equator of earth? it will be A. Heavier than present value B.lighter than present value C.weightless And also what is the reason? 2.a girl sitting on

    asked by edward on March 1, 2013
  55. Math

    A probe launched from Earth to Mars is traveling at an average speed of 1.8 * 10^4 kilometers per hour. If the distance between Earth and Mars is approximately 2.25 * 10^6 kilometers, about how many hours will it take the probe to reach Mars? PLEASE

    asked by Kimbo on April 12, 2015
  56. geometry

    radius of 3960 miles cause there 5280 feet find length in feet by circumference of earth use ~3.14

    asked by tie on September 20, 2010
  57. PHYSICS

    Find the period time of the moon from the following values, R=6400km,the distance between the earth and the moon=384000km,g=9.8m/s2

    asked by NANDU on January 13, 2012
  58. physics

    A hockey puck moving due east with speed 1.00 m/s collides with an identical puck moving 40 degrees south of west with speed 2.00 m/s. After they collide, the first puck is moving south with speed 1.50 m/s. What is the direction and speed of the second

    asked by Jess on September 16, 2010
  59. Calculus

    a car is traveling along a highway shaped like a parabola with its vertex at the origin. the car starts at 100 miles north and 100 miles west. there is a statue at 100 miles east and 50 miles north. at what point will the cars headlights hit the statue?

    asked by Hayden on December 9, 2016
  60. AP us history

    I have the answers will you just tell me if I'm right? This is for my final study guide. The Compromise of 1850 affected which states an/or Territiries? A. Texas, New Mexico, California B. Utah, Texas, California C. CALIFORNIA, OREGON, AND MISSIOUR D.

    asked by Andrea on December 12, 2012
  61. reading

    (1) Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. (2) A greenhouse stays warm because sunlight and heat coming through the glass roof are mostly trapped. (3) The heat doesn't radiate back into the

    asked by Anonymous on March 20, 2016
  62. Math grd12

    Gisela lives in a subdivision where the streets are laid out in a grid pattern. Her school is eight blocks south and six blocks east of her home. How many different direct routes could she take when she bicycles to school if she always stops by her

    asked by Celina on November 22, 2010
  63. PHYSICS

    A long, straight wire lies on a horizontal table and carries a current of 1.45 µA. In a vacuum, a proton moves parallel to the wire (opposite the current) with a constant speed of 3.00 104 m/s at a distance d above the wire. Determine the value of d.

    asked by Physics on May 26, 2010
  64. Physical science CHECK my answers

    1. Which of the following correctly lists friction types (excluding fluid friction) from strongest to weakest? (2 points) * a. static, sliding, rolling b. sliding, static, magnetic c. weak, strong, nuclear d. rolling, sliding, static*** 2. Two or more

    asked by Anon on June 8, 2017
  65. Chemistry

    What factors control the bond length in a covalent bond? Select all that apply. -It involves the attraction between the two nuclei involved in the bond. -It involves the attraction between the electrons in the bond and the nuclei of the atoms. -It involves

    asked by Anonymous on March 23, 2014
  66. Physics

    I have a question about the International Space Station-Its been orbiting earth at 350km-If the radius of the earth is 6,370 km, what is the period of orbit for the Space Station? Secondly, if it was moved to a geosynchronous orbit, what would the new

    asked by Julie on December 1, 2010
  67. trig-math

    4. A carpenter wants to be sure that the corner of a building is square and measures 6.0 ft and 8.0 ft along the sides. How long should the diagonal be? A. 12 ft B. 10 ft C. 11 ft D. 14 ft 5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far

    asked by LOVE on April 28, 2012
  68. Bio

    1. An isotope is an atom of an element that varies in mass number due to variation in the number of: A. atoms. B. protons. C. neutrons. D. electrons. is it C 2, A covalent bond is: A. the attraction that one atom has for another atom. B. the attraction

    asked by Amy on July 10, 2013
  69. physics

    The De-orbit Burn The Shuttle must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth. In order to reduce the velocity and change the orbit of the Shuttle, a maneuver called the de-orbit burn is performed. For this

    asked by de wae on January 11, 2018
  70. Physics

    You drive due east at 78 km/h for 55 min. Then you follow a road going 60 degrees south of east, going 99 km/h for another 38 min . Find your total displacement.

    asked by Marcus on October 6, 2010
  71. Physics

    For a I got 36666.67 seconds which I don't know if its right and then b I know my answer is wrong because I got 0.0375 for wavelength.And I don't understand how to do e or f.   The Voyager 1 spacecraft is at the edge of the solar system, about 11 billion

    asked by Kimia on May 10, 2017
  72. social studies

    1. Place the events in early South American history in correct chronological. Place the earliest event at the top and the last event at the bottom. South Americans began to domesticate plants. The Tiahuanaco empire expanded. The Norte Chico civilization

    asked by con on December 18, 2018
  73. physics

    1. What did Newton conclude about the force that pulls apples to the ground and the force that holds the moon in orbit? 2. What does the very small value of the gravitational constant G (in standard units) tell us about the strength of gravitational

    asked by confused on July 13, 2010
  74. civics

    Which of the following correctly describes an example of how climate affected the settlement in North America ? A. most of the United states settled in the Midwest, where temperatures are less extreme. B.Most of Canada's population lives along the southern

    asked by sam on June 4, 2014
  75. Science

    A new geosynchronous satellite needs an orbit of 35.7 km . The mass of the Earth is 5.97x 10^24 Kg and the radius of Earth 6.4 x 10^3 km. The mass of the satellite is 200 Kg. What velocity will it need to achieve that orbit?

    asked by Boberto on November 30, 2016
  76. Physics

    The acceleration of gravity at the surface of the moon is approximately 1/6 that at the surface of the Earth (9.8m/s). What is the weight of an astronaut standing on the moon whose weight on Earth is 180lbs?

    asked by Ashley on March 8, 2012
  77. Algebra

    Your weigh on the moon is about 1/6 of your weigh on earth. Write and solve an equation to show how much a person weighs on earth if he weighs 16 lbs. on the moon .

    asked by Ella on February 4, 2016
  78. science

    The gravitational pull on Jupiter is 2.5 times greater than Earth's gravitational pull. If an object weighs 10 pounds on Earth, what will it weigh on Jupiter?

    asked by denzel on January 28, 2011
  79. Physics

    What astronomical event would be seen by observers on the Moon at the time the Earth experiences a lunar eclipse? At the time the Earth experiences a solar eclipse?

    asked by Nikki on February 23, 2008
  80. Physics

    a 4 kg object is taken to a planet that has 3 times the mass of earth and 1/2 the radius of earth. On this planet the mass of the object will be most nearly.. A. 12kg B. 3kg C. 48kg D. 4kg E. 24 kg

    asked by NATHAN on January 5, 2015
  81. Science

    The speed of light is 3 x 10 to the 8th power meters per second. If the sun is 1.5 x 10 to the 11th power meters from earth, how many seconds does it take light to reach the earth?

    asked by MG on December 15, 2014
  82. Science

    A new geosynchronous satellite needs an orbit of 35.7 km . The mass of the Earth is 5.97x 10^24 Kg and the radius of Earth 6.4 x 10^3 km. The mass of the satellite is 200 Kg. What velocity will it need to achieve that orbit

    asked by Boberto on November 30, 2016
  83. Physics repost

    I apologise for reposting this question but it is still not working out for me. I know that: speed of light c=3.0x10^8 Time interval delta t=0.19x10^-9s The relationship between actual time and roudtrip distance is d=ct Also if there is and uncertainty of

    asked by Mary on October 17, 2007
  84. Math

    Suppose a South Korean inspirational speaker speaks from a rectangular stage measuring 30 feet by 70 feet. Find the area of the stage.

    asked by Chirstine on January 23, 2018
  85. Geometry

    A family vacationed at a beach 120 mi east and 30 mi south of their home. Find the distance and the direction from their home to the beach.

    asked by George on September 21, 2013
  86. Physics

    You drive due east at 77 km/h for 55 min . Then you follow a road going 60∘ south of east, going 96 km/h for another 28 min . Find your total displacement.

    asked by Anonymous on January 27, 2017
  87. physics

    A satellite is orbit about earth, its orbital radius is 3.43*10e7m.The mass of the satellite is 9166kg and the mass of earth is 5.974*10e24kg. Determine the orbital speed of the satellite in mi/s. 1mi/s=1609m/s.

    asked by shug on October 1, 2010
  88. physics

    A rocket cruising past earth at 0.800c shoots a bullet out the back door,opposite the rocket's motion,at 0.900c relative to the rocket. What is the bullet's speed relative to the earth?

    asked by Ted on April 11, 2013
  89. English

    1. We will lead your children to the joys of reading. 2. We will lead your children to the joy of reading. 3. We will lead your children to joy of reading. (Which expressions are grammatical? Are both acceptable?) 4. I learn many things in class from her

    asked by rfvv on December 12, 2009
  90. Physics

    A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?

    asked by Anonymous on April 27, 2016
  91. Physics

    A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?

    asked by Ben on April 27, 2016
  92. math

    A train leaves a station and travels north at a speed of 105 mph. Two hours​ later, a second train leaves on a parallel track and travels north at 135 mph. How far from the station will they​ meet? please help

    asked by Madison on October 4, 2016
  93. Social Studies

    Which ones are true? a) Some people in northern Chad are nomadic and raise camels and plant crops in oases due to lack of arable soil. True b) In parts of West Africa they are careful not to cut down trees to make arable land. False c) c. Tension exists in

    asked by Marija Dacosta on November 17, 2015
  94. physics

    how can i use a compass to determine whether a needle is magnetized? put the needle in a cup of water very carefully. It will float. Now if the needle is magnetized it will point north/south no matter how you carefully rotate the cup. You can check the

    asked by koeit on June 4, 2007
  95. Physics

    An earth satellite moves in a circular orbit with an orbital speed of 5800 m/s. Find the time (expressed in seconds) of one revolution of the satellite. Find the radial acceleration of the satellite in its orbit. I think we need to know the radius of the

    asked by Josh on September 22, 2006
  96. math question

    Problem Find an approximate value for the rate at which the moon orbits the earth. Assume that the moon’s orbit is circular.

    asked by sherri on October 6, 2008
  97. social studies

    Which of the following is a likely reason that someone today might decide to move from a city in the Midwest to the South? 1. A. the decline of manufacturing in the Midwest B. the many high tech jobs available in the South----- C. urban overcrowding in the

    asked by ben on September 11, 2018
  98. Earth physics I think

    Keplerian motion/Analemma Does the earth actually alter speed or is it a result of the earth being closer to the sun at some points in its eliptical orbit or BOTH? Additionally does anyone know where the value of the earth/sun analemma can be found. I read

    asked by MIKE on October 19, 2006
  99. Sci

    Does my poem below have these things "explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would interact with that other element" Here is the Poem Below: “What’s

    asked by Anonymous on December 30, 2010
  100. Sci Plzz See This Post

    Does my poem below have these things "explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would interact with that other element" Here is the Poem Below: “What’s

    asked by Anonymous on December 30, 2010