What is an atomic number of an atom?

The atomic number of an atom is the number of protons in the nucleus of the atom. It is a unique identifier for each element on the periodic table, as each element has a different number of protons in its nucleus. The atomic number determines the chemical properties of an element and its place on the periodic table.

The atomic number of an atom is the number of protons in its nucleus. It is unique for each element and determines the element's chemical properties.