potassium, sodium, lithium are metals belonging to group no.1, how does reactivity vary-increasing or decreasing from the top to bottom in the periodic table?

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.

Ibelieve your answer is true 

Perimeter? wheres the answers