Titanium 2+ Ion electronic structure?

[Max Eilerson]

Titanium 2+ Ion.

Is it $$[Ar]3d^04s^2$$
or $$[Ar]3d^24s^0$$

I'd assume it's the former (looks more energy efficient).

 

[geoffjb]

Titanium 2+ Ion.

Is it $$[Ar]3d^04s^2$$
or $$[Ar]3d^24s^0$$

I'd assume it's the former (looks more energy efficient).

That's right. 4s is of lower energy than 3d.