According to Hund's rules, the lowest (ground) state of the silicon atom

a. has four unpaired electrons

b. has three sets of paired electrons

c. has 2 unpaired electrons

d. has three different orbitals less than fully occupied

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.

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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the answers are

c and c