How does the atomic number compare with the atomic weight?

Answer 1

The different isotopes have different Atomic Mass numbers, because the isotope has different numbers of neutrons. The protons and electrons are the same, so the change in mass number is the same as the change in the number of neutrons.

Answer 2

Atomic Mass is the average masses of all the isotopes known for that element as they occur in earth's nature.

Atomic number is the element's identity, the number of protons the nucleus has, will never change.

Mass number is [NOT just another way to say atomic mass.]

Added:

Mass number is equal to the number of protons AND neutrons, that is of ONE particular isotope of an element. This is a round figure, not an average like atomic mass.

Answer 3

The atomic number represents the number of protons in an atom's nucleus, defining the element, while the atomic weight is the average mass of all isotopes of an element based on their abundance. Atomic number is a whole number, unique to each element, while atomic weight is a decimal value that considers isotopic variations.

Answer 4

atomic number is the amount of protons. atomic weight is the mean atomic mass measured by the quantity of protons and neutrons taking into account all isotopes and their relative abundances.

Answer 5

The number of protons equal the atomic number.

Answer 6

Atomic number is equal to number of protons. They are same in number.

Answer 7

Not sure