Question

Why is atomic number used to identify elements?

Answer 1

The atomic wide variety or proton wide variety (symbol Z )of a chemical detail is the wide variety of protons observed withinside the nucleus of each atom of that detail. The atomic wide variety uniquely identifies a chemical detail. It is the same as the rate wide variety of the nucleus. In an uncharged atom, the atomic wide variety is likewise the same as the wide variety of electrons.

Complete answer:
The atomic wide variety stands for the wide variety of protons in an atom of the detail.
The wide variety of protons determines the identification of the detail,
So the atomic wide variety identifies the detail. Atoms with the equal atomic wide variety however unique neutron numbers, and as a result unique mass numbers, are called isotopes. A little greater than three-quarters of evidently going on factors exist as an aggregate of isotopes and the common isotopic mass of an isotopic aggregate for a detail (known as the relative atomic mass) in a described surroundings on Earth, determines the detail's preferred atomic weight.
Each detail has a selected set of chemical homes resulting from the wide variety of electrons gift withinside the impartial atom, which is (the atomic wide variety). The configuration of those electrons follows the concepts of quantum mechanics.

Note:
The wide variety of electrons in every detail's electron shells, in particular the outermost valence shell, is the number one aspect in figuring out its chemical bonding behavior. Hence, it's far the atomic wide variety on my own that determines the chemical homes of detail; and it's far for that reason that detail may be described as which includes an aggregate of atoms with a given atomic wide variety.