Periodic Chemical Reactivity Reactions with hydrogen to form hydrides: LiH vs.HF (notice electronegativity difference) Reactions with fluorine: -HF VS.F2 ionic covalent Reactions with oxygen: -Li2O vs.CO2 vs.F2O Can we predict these structures? Can we understand their properties? Yes,we can!We use Lewis dot structures based on valence electrons. V-2Periodic Chemical Reactivity Reactions with hydrogen to form hydrides: Reactions with fluorine: Reactions with oxygen: Can we predict these structures? Can we understand their properties? Yes, we can! We use Lewis dot structures based on valence electrons. HF vs. F2 LiH vs. HF (notice electronegativity difference) ionic covalent Li2O vs. CO2 vs. F2O V-2