What is a atomic number in a element?
The atomic number of an element refers to the number of protons
in the nucleus of the atom of that element, and is unique to each
element. The atomic weight is the weight of an atom of the element
compared with the weight of a single proton, and consists of number
of protons and neutrons in the nucleus of the atom of that element,
and different atoms of the same element can have different numbers
of neutrons, and therefore more than one atomic weight: it is
usually given as an average. the atomic number on an element is
simply the number of protons and electrons in the element. however,
it is not the total number of them.