# 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 of protons, which is equal to the number of electrons.

Atomic mass number is the number of protons plus neutrons.

so for H meaning Hydrogen it would be 1 for all of them, except nuetrons being 0 because 1 atomic mass- 1 proton= 1 neutron.

That's correct, but note that for the mass (expressed in atomic mass units) it is just an approximation. The atomic mass is slightly different from the atomic mass number.

The atomic mass unit is defined such that the carbon-12 isotope has a mass of exactly 12 atomic mass units. So, for carbon-12 (this isotope has 6 neutrons and 6 protons) the atomic mass expressd in atomic mass units is exactly the same (by definition) as the atomic mass number.

For other elements this is not the case. The atomic mass number will, of course, always be an integer number, being equal to the sum of the number of protons and neutrons. But the value of the mass expressed in atomic mass units won't be an exact integer (except for the carbon-12 isotope).

what is on the final exam

1. 👍 0
2. 👎 0
3. 👁 421
1. (|==============3

1. 👍 0
2. 👎 2
posted by 23

## Similar Questions

1. ### chemistry

1.what is meant by atomic number of an element? 2.the mass number of an element is 18,it contains 7 electrons.what is the number of protons and neutrons in it?what is the atomic number of the element? 3.an element has an atomic

asked by pooja on May 4, 2012
2. ### 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

asked by Chelsea on October 10, 2008
3. ### Chemistry

41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons. This is what I got- Protons: 19 Neutrons: 20 Electrons: ? Thanks -MC

asked by mysterychicken on October 22, 2010
4. ### US History

41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons. This is what I got- Protons: 19 Neutrons: 20 Electrons: ? Thanks -MC

asked by mysterychicken on October 22, 2010
5. ### spin of a electron

I have to know the spin of a electron and what I have in my notes has me confused. 1. If the # of neutrons and # protons of a element are odd the element has a whole spin # (1, 2, 3) examples given: 2 H 11 B 14 N 17 O 33 S 35 Cl

asked by ~christina~ on December 8, 2007
6. ### Science

if an atom has 17 electrons and its mass number is 35, calculate the following: number of protons, atomic number, and number of neutrons. i think there would be: an atomic number of 17, there would be 17 protons, and there would

asked by Sam on September 11, 2017
7. ### Chemistry

Plutonium-239 is used in nuclear bombs. Determine the number of protons and neutrons in plutonium-239. I really don't understand this. Can someone tell me how to do this? thanks What is the atomic number of Pu? Look it up on the

asked by Benny on February 8, 2007
8. ### Chemistry

The standard atom for the atomic masses of all the elements is the atom of carbon which has 6 protons and 6 neutrons (12C) and is assigned the atomic mass of exactly 12. Under this standard, the atomic mass of iron, atomic number

asked by Anonymous on September 19, 2008
9. ### 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

asked by Spring Allergies on September 30, 2019
10. ### Chemistry

I have to write a bunch of atomic symbol for these isotopes and I don't understand how to I do it. (a) atomic number=53, number of neutrons=79 I looked at the periodic table for 53 so the element is Iodine. So They gave the atomic

asked by SC on April 6, 2010

More Similar Questions