Which group of elements has seven valence electrons?
a) the carbon family b) the halogens c) the halogens d) the noble gases

The answer is -

Halogens, the elements in the family are fluorine, chlorine, bromine, iodine, and astatine.

They each have 7 valence electrons hence the reason they're the most active non-metals

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the answer would be b i believe

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.