Answer:
1.
Chemical formula: CaBr2
Chemical name: calcium bromide (calcium has only one valence, so it isn't necceseraly to name it)
Cation: Ca^2+
Anion: Br^-
Chemical formula: NiO
Chemical name: Nickel(II) oxide
Cation: Ni^2+ (the name Nickel (ii) come from its valence)
Anion: O^2-
Chemical formula: Cd3N2 (notice that the addition of the valences of all elements is equal to zero because compounds are neutral, that is, 3*(2+) + 2*(3-) = 0)
Chemical name: Cadmium(II) nitride
2.
Chemical formula: SiI4
Chemical name: Silicon tetraiodide
Chemical formula: N2O (as it name states, 2 atoms of N and 1 atom of O)
Chemical name: dinitrogen monoxide
Chemical formula: P4O10 (it's actually composed by two molecules of P2O5)
Chemical name: Phosphorus pentoxide
