a) An element is made of 1 type of atom (e.g. N)
b) For this question you should use a periodic table:
He = Helium
H = Hydrogen
P = Phosphorus
Cu = Copper
Cl = Chlorine
Pt = Platinum
Na = Sodium
Fe = Iron
c) A molecule has 2 or more of the same type of atom bonded together (e.g. N2)
Di) H, P, Cl
Dii) He, Cu, Pt, Na, Fe
