There are two main ways that minerals are classified. which identifies those two main ways?

a. country of origin and chemical makeup

b. chemical makeup and use

c. crystal structure and economic value

d. use and economic value

a electronegativity decreases beacuse the size of nucleus is bigger.

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.