1.8 ActivitiesRemember1. A chemical formula is a shorthand way of writing the name of an element or compound2. A molecular formula is describing the number and type of atoms that join to make a molecule3. The formula of a compound shows you the symbols of the elements used to make the compound, and the ratio in which the atoms joined together4. Na, H, K, Pb, Cl, I, S5. A) Hydrogen, Nitrogen, Oxygen B) Sodium, Hydrogen, Carbon, OxygenC) Iron, Sulfur6. The valency is determined by how many electrons and atom needs to lose in order to have a full outer shell7. A) 2B) 3C) 18. 1+, 1+-, 4, 1-, 1-, 2+, 2-Think1. NaCl, NaOH, Na3N, Na2O, Na2SO4, FeCl3, FeOH3, FeN, Fe2O3, Fe2(SO4)3, LiCl, LiOH, Li3N, Li2O, Li2SO4, CuCl2, CuOH2, Cu3N2, CuO, CuSO4, AlCl3, AlOH3, AlN, Al2O3, Al2(SO4)32. A) O2B) Cl2C) PbD) NOE) ZnOF) K2SG) Ca(OH)23. A) Ammonium chlorideB) Potassium IodideC) Aluminium trinitrateD) Iron hydroxideE) Potassium bicarbonateF) Magnesium carbonateG) Hydrogen nitrate