A excellent place to begin once trying to figure out the electron configuration of an ion is the electron configuration of the neutral parent atom.

In this case, titanium, #"Ti"#, is situated in period 4, group 4 of the regular table and also has an atomic variety of #22#.

This indicates that a neutral titanium atom will contain #22# proloads in its nucleus and #22# electrons surrounding its nucleus.

Thus, the electron configuration of a neutral titanium atom should account for #22# electrons. Consequently, the electron configuration of the titanium(II) cation, #"Ti"^(2+)#, should account for #20# electrons, given that this cation is developed once a neutral titanium atom loses #2# electrons.

The electron configuration of a neutral titanium atom looks prefer 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 for the electron configuration is advantageous as soon as adding electrons to build an atom "from scratch" because in that instance, the #4s# orbital is filled before the #3d# orbitals.

That happens bereason the empty #3d# orbitals are actually higher in energy than the empty #4s# orbital, as viewed here

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However, as soon as the #4s# orbital is filled, it becomes higher in power than the #3d# orbitals.


You are watching: Draw the electron configuration for a neutral atom of titanium.


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This indicates that when titanium loses electrons, it does so 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 lost as soon as the #"Ti"^(2+)# is formed will certainly come from the #4s# orbital, which implies 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 you want, you can use the noble gas shorthand notation to write

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

Here #<"Ar"># represents the electron configuration of argon, the noble gas that comes instantly before titanium in the regular table.