What is an atom called
at has gained or lost electrons?
a. molecule.
b. ion.
c. polar
d. nonpolar.

I believe it's A. molecule

Explanation:

b. Ion.

Explanation:

Examples of ions are:

Na+ , where the sodium atom has lost 1 electron.

Cl-  , where the chlorine atoms has gained 1 electron.

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.

a is the correct answer