Day 8 Ionic Bonds ct’d Science 10

Ionic bonds form Ionic compounds Form between positive & negative ions Electrical attraction due to opposite charges Occurs due to a transfer of electrons from the metal to the non-metal Metal + non-metal (cation + anion)

Li Cl Li+ + Cl - LiCl Ionic bonds Li will lose 1 e- Cl needs 1 e- The ionic compound formed is LiCl (lithium chloride) *we will do more on this later Li Cl Li+ + Cl - LiCl 1+ 1- All compounds must be neutral (charges must add up to zero)

Mg Cl Cl Mg2+ + Cl - + Cl - MgCl2 Ionic bonds -Mg will lose 2 e- -Cl only needs 1, so we need 2 Cl- The ionic compound formed is MgCl2 (magnesium chloride) Mg Cl Cl Mg2+ + Cl - + Cl - MgCl2 2- (1- x 2) 2+ All compounds must be neutral (charges must add up to zero)

Practice For each pair of elements draw the Lewis structure add arrows to show the electron transfer (the bond) write the formula for the ionic compound. Li and F Be and O Al and N Sr and P Mg and Br Na and Se Ba and As K and O Tl and Cl Ga and S sulfur and magnesium oxygen and cesium chlorine et indium radium and nitrogen