What's the difference between atomic number and atomic mass number?

Answer 1

Atomic number is the number of protons in a nuclide. This identifies the element.

Mass number is the number of nucleons in a nuclide, a nucleon being a proton or a neutron. This, together with the atomic number, identifies which isotope of the element it is.

Answer 2

Mass number: The number of protons + neutrons in an atom (Hydrogen: 1.008/ Lithium: 6.941)

Atomic number: It is the number of protons in an atom. (This is the number the element is listed under: Ex Hydrogen (H) 1/ Lithium (Li) 3)

not so sure about this answer... i will edit when i get the answer...

Answer 3

Atomic Mass is the average relative mass (average mass of all the possible isotopes)

mass number is the number of protons plus neutrons in an atom

atomic number is the number of protons in the element.

Answer 4

The atomic number represents the number of protons in an atom's nucleus, determining its element on the Periodic Table. The atomic mass number is the sum of protons and neutrons in the nucleus, providing an atom's mass.

Answer 5

Atomic number is the number of protons in the nucleus. Mass number is the number of protons plus neutrons.

Answer 6

We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.

Answer 7

atomic mass is the number of protons in an atom

mass number is the number of protons plus neutrons in an atom