The denser a substance, the more tightly packed it is. the table below shows the volume and mass of two different substances:

which of the two substances is more tightly packed?
object r is more tightly packed.
object s is more tightly packed.
both objects are packed equally tightly.
this cannot be determined.

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

indium, and thallium have three electrons i think

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.