Answer:

i) $Li_2O$ is formed when the alkali metal lithium (with one valence electron) and group 16 element oxygen (with two valence electrons) mix.
(ii) The alkaline earth metal magnesium (which has two valence electrons) interacts with the group 5 element nitrogen (which has three valence electrons) to generate $Mg_3N_2$.
(iii) All 3 is formed when group 13 element aluminum (with 3 valence electrons) and group 17 element iodine (a halogen with valence 1) mix.
(iv) SiO 2 is formed when group 14 element silicon (with a valence of 4) and group 16 element oxygen (with a valence of 2) mix.
(v) Phosphorus (with valence 3 or 5) from group 15 interacts with fluorine (a halogen with valence 1) from group 17 to generate $PF_3$ or $PF_5$.
(vi) Element 71 (4f 14 5d 1 6s 2), which has three electrons in its valence shell, combines with group 17 element fluorine (a halogen with valence 1) to produce $EF_3$, where E is the element’s symbol.