Question

Choose the ground state electron configuration for ti2+. choose the ground state electron configuration for ti2+. [ar]4s2 [ar]3d4 [ar]3d2 [ar]4s23d4 [ar]4s23d2

Answer 1

the atomic number of Ti is 22
the ground state electronic configuration for the neutral atom Ti is 
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²
we can write in the condensed form with the nearest noble gas that is Ar with atomic number 18
[Ar] 4s² 3d²
when Ti loses 2 electrons, it loses it from the outermost shell that is orbital 4s.
Therefore electronic configuration of Ti²⁺ is 
[Ar] 3d²

Answer 2

The ground state electron configuration for Ti²⁺: [Ar] 3d²

Further explanation

In an atom there are levels of energy in the shell and sub shell

This energy level is expressed in the form of electron configurations.

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is

• s: 2 electrons

• p: 6 electrons

• d: 10 electrons and

• f: 14 electrons

Charging electrons in the sub shell uses the following sequence:

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.

Determination of electron configurations based on principles:

• 1. Aufbau: Electrons occupy orbitals of the lowest energy level

• 2 Hund: electrons fill orbitals with the same energy level

• 3. Pauli: no electrons have the same 4 quantum numbers

Ti or Titanium is a transition element with atomic number 22

so the electron configuration of the element Ti  :

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d² or can be written with the symbol of the noble element Ar:

[Ar] 3d² 4s²

The cation of Ti²⁺ shows that the element Ti releases 2 electrons so that the electron configuration :

[Ar] 3d² (the electrons are removed first from the largest n, 4s)

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