Predict how many electrons each element will most likely gain or lose.
(a) I-Belongs to group 17 and hence has 7 electrons in the valence shell.I has a tendency to gain 1 electron to complete its octet
(b) Ba-Belongs to group 2 and hence has 2 electron in the valence shell. Ba has a tendency to lose these 2 electrons
(c) Cs-Belongs to group 1 and hence has 1 electron in the valence shell.Cs has a tendency to lose this outermost electron
(d) Se-Belongs to group 16 and hence has 6 electrons in the valence shell.Se has a tendency to gain 2 electrons to complete its octet