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 ...

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 ...

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 ...