Ans: Titanium
The distribution or arrangement of electrons in elements is represented in terms of electron configuration which depicts the electron occupation in various orbitals.
the s orbital has only one level and holds 2 electrons
p-orbitals have 3 sublevels and holds a maximum of 6 electrons
d-orbitals have 5 sublevels and holds a maximum of 10 electrons.
The element with two half filled orbitals in the ed sublevel must have an outer electron configuration of 3d²
Therefore, the inner electrons must be filled as follows:
1s²2s²2p⁶3s²3p⁶4s²3d²
The total number of electrons is 22. The element with the atomic number 22 is titanium (Ti)