Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

- C. Halogen

Explanations:- Metals loses electrons to make cations where as non metals gain electrons to make anions.

So, Alkali metals and Transition metals are eliminated as they lose electrons to make cations.

Boron is a non metal but rest of the elements of its group are post transition metals and they also lose electrons to make cations.

Halogens are non metals are highly electron negative in nature so they gain electrons to form anions.

Hence, the right choice is C. Halogens.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.