There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

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 ...

So although chlorine has a mass number of 35 which ... but different atomic number, Z, and different chemical symbol - they are not the same element. If the number of protons changes, then it ...