When transition metal atoms lose electrons to form ions, the electrons come first from the highest filled s atomic orbital. with this in mind , how many unpaired electrons are present in the fe2+ ion? hint: first write the outermost electron configuration of fe atom?

The atomic number of Fe= 26

The electronic configuration of Fe will be

1s2 2s2 2p6 3s2 3p6 4s2 3d6

When it loses two electrons to form ferrous ion (Fe(II)) the electrons will be loose by 4s orbital first

So the electronic configuration of Fe^+2 ion will be

1s2 2s2 2p6 3s2 3p6  3d6

Hence there are six electrons in 3d orbital of iron dipositive ion

Now the the electrons in 3d orbital will be like:

so there are four unpaired electrons

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.