1. Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. How is this possible? 2. Examine the three-dimensional geometries of PF 5 and SF 4 shown here. Which compound...

1. Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. How is this possible?

2. Examine the three-dimensional geometries of PF₅
and SF₄
shown here. Which compound do you think is more polar?

3.In each of these molecules, which atom carries the greater positive charge:


?