Question

when looking at the periodic table, the whole number of an element represents the
chlorine
17
ci
35.453
atomic number
atomic level
atomic mass

Explanation:

In the periodic table, the whole - number for an element is its atomic number, which is the number of protons in the nucleus of an atom of that element. For chlorine, the whole number 17 is its atomic number. Atomic level is not a whole - number value shown in the periodic table box for an element in this context. Atomic mass is the weighted average mass of an element's isotopes and is usually a non - whole number as seen with chlorine's 35.453.

Answer:

A. atomic number