You Know It

Atomic # = Protons 

Atomic # = The way in which the elements are listed on the Periodic Table   EX: Atomic #1 is H, which is the first Element in the table) 

Mass # = Protons + Neutrons 
Nucleus = Protons & Neutrons 

Protons = Positive charge 

Neutrons = Same weight as protons but have a neutral charge 

Electrons = Negative charge, & they exist outside the nucleus