In the molecule PCl3PCl3, phosphorus makes three covalent bonds. Therefore, three of its five valence electrons need to be unpaired. The orbitals with the same energy are known as degenerate orbitals. For example, the p subshell has three degenerate orbital, namely, pxpx, pypy, and pzpz. How many degenerate orbitals are needed to contain five electrons with three of them unpaired?

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

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.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.