A an excellent place to start as soon as trying to figure out the electron construction of an ion is the electron construction of the neutral parent atom.

In this case, titanium, #"Ti"#, is situated in duration 4, team 4 the the routine table and also has an atomic number of #22#.

This means that a neutral titanium atom will contain #22# protons in that is nucleus and also #22# electrons neighboring its nucleus.

Therefore, the electron construction of a neutral titanium atom need to account because that #22# electrons. Consequently, the electron construction of the titanium(II) cation, #"Ti"^(2+)#, must account because that #20# electrons, since this cation is formed when a neutral titanium atom loses #2# electrons.

The electron construction of a neutral titanium atom looks like this

#"Ti: " 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^2#

Now, it"s essential to keep in mind that this notation because that the electron configuration is beneficial when adding electrons to construct an atom "from scratch" due to the fact that in that case, the #4s# orbital is to fill before the #3d# orbitals.

That happens due to the fact that the empty #3d# orbitals room actually higher in power than the empty #4s# orbital, as checked out here

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However, when the #4s# orbit is filled, it i do not care higher in power than the #3d# orbitals.


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This means that when titanium loses electrons, it does for this reason from the #4s# orbital first.

#"Ti: " 1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2#

Therefore, the two electrons that are shed when the #"Ti"^(2+)# is formed will come from the #4s# orbital, which way that the electron configuration of the cation is

#color(green)(|bar(ul(color(white)(a/a)color(black)("Ti"^(2+): 1s^2 2s^2 2p^6 3s^2 3p^6 3d^2)color(white)(a/a)|)))#

If girlfriend want, you deserve to use the noble gas shorthand notation come write

#color(green)(|bar(ul(color(white)(a/a)color(black)("Ti"^(2+): <"Ar"> 3d^2)color(white)(a/a)|)))#

Here #<"Ar"># to represent the electron construction of argon, the noble gas the comes automatically before titanium in the periodic table.