Each element in the periodic table has: A unique symbol – a one or two-letter abbreviation used to represent the element. An ...

The full chemical symbol for an element shows its nucleon number (A) at the top, and its proton number (Z) at the bottom. This symbol tells you that the chlorine atom has 17 protons. It will also ...

The weighted mean mass of chlorine is 35.5. The relative atomic mass of an element is a weighted mean mass of the isotopes of an element compared with that of the 12 C isotope, which has a mass of ...