Need with this : titanium has z=22 has many electrons in n=3?

Ten electrons.

Explanation:

The atomic number of titanium is 22.

It means a neutral atom will have 22 electrons.

We fill the electrons in an atom based on three principles

a) Auf Bau Principle

b) Hund;s rule

c) Pauli's exclusion principle.

So based on these three the electronic configuration of titanium will be:

1s²  2s²  2p⁶  3s² 3p⁶ 4s² 3d²

Thus there are three orbitals in n = 3 shell

The number of electrons in n=3 shell = 2 + 6 +2 = 10.