if we continue heating a piece of initially room-temperature metal in a dark room, what will be its first visible color?

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.

It is 4.92 e-4 sorry if i am wrong

You would do 1500/4 and the answer is 375