How Many Orbitals Are in G?

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Simply so, how many electrons does the G orbital hold?

18 electrons

Secondly, how many orbitals are in F? 7 orbitals

Similarly, do g orbitals exist?

Yes, g orbitals exist and no, they are not hypothetical. It is true that there is no element that has an electron in a ground state g orbital but that is not the same as saying that these orbitals do not exist. So when an electron is excited into a higher energy state, that energy state can be a g orbital.

How many orbitals are there in total?

The number of orbitals in a shell is the square of the principal quantum number: 1² = 1, 2² = 4, 3² = 9. There is one orbital in an s subshell (l = 0), three orbitals in a p subshell (l = 1), and five orbitals in a d subshell (l = 2). The number of orbitals in a subshell is therefore 2(l) + 1.