What is considered the foundation level of organization in an environment?

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

Nonmetals usually react by gaining electrons

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.