Question

When lithium reacts with bromine to form the compound LiBr each lithium atom

Answer 1

Answer: (3) loses one electron and becomes a positively charged ion

Explanation:

Lithium bromide is formed by combination of lithium cation and bromine anion.

Electronic configuration of lithium:

$[Li]=1s^22s^1$

Lithium atom will loose one electron to gain noble gas configuration and form lithium cation with +1 charge.

$[Li^+]=1s^2$

Electronic configuration of bromine:

$[Br]=[Ar]3d^{10}4s^24p^5$

Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.

$[Br^-]=[Ar]3d^{10}4s^24p^6$

In lithium bromide, one electron from lithium metal gets transferred to bromine atom.

Answer 2

(1) gains one electron and becomes a negatively charged ion
(2) gains three electrons and becomes a negatively charged ion
(3) loses one electron and becomes a positively charged ion
(4) loses three electrons and becomes a positively charged ion