E Which argument best explains the charge of an atomic nucleus?
An atomic nucleus is positively charged because it is composed of neutrons.
O An atomic nucleus is positively charged because it is composed of protons.
O An atomic nucleus is negatively charged because it is composed of electrons.
O An atomic nucleus is negatively charged because it is composed of neutrons.
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the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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.