Question

Why atomic number is called the proton number wiki answer?

Answer 1

The number of protons in the nucleus of an atom is equal to atomic number. Therefore atomic number is called proton number.

Hope this helps u.

Answer 2

Here is your answer mate...✌✌✌,

The mass number (symbol A, from the German word Atomgewicht (atomic weight), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.