True or False 9. The number of protons will tell you what element it is. 10. The Atomic Mass - (minus) The Atomic Number tells you the number of protons in an element. 11. If an element is an ion, it has more or less neutrons than usual. 12. Elements in the same vertical column are called Periods. 13. The 3 groups of the periodic table are metals, non-metals, and gases. Help please:))) sorry im not really good with physical science:(