How many unpaired electrons does tin have?

Answer 1

Two.

Titanium has an atomic number of 22.
To check for unpaired electrons, you only need to check the valence shell, or the one that is not filled.

1s2(2), 2s2(4), 2p6(10), 3s2(12), 3p6(18), 4p2(20),

These shells are all filled, and there are two electrons left to go in the d shell. Because the d shell has five subshells, and electrons cannot pair until all subshells are filled, both these electrons are unpaired.

Answer 2

The electron configuration for Titanium is [Ar]4s23d2 so there are two unpaired electrons - those in the 3d level.