Which term describes a pure substance that is made up of only one type of atom?

1)matter
2)rock
3)compound
4)element

The term which describes a pure substance that is made up of only one type of atom is an element.
Compound is made up of many different elements combined into one. The other choices don't make sense. 

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.