Can some please help me understand what this means!! Write the electron configurations of the following elements. Only write them as noble gas or full if it states to do so.

1. Phosphorus (P) Full configuration :

2. Ruthenium (Ru) Full configuration :

3. Barium (Ba) Noble gas configuration :

4. Thorium (Th) Noble gas configuration :

Phosporus- 1s2 2s2 2p6 3s2 2p3

Ruthenium- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d6

Barium- (Xe)6s2

Thorium- (Rn) 6d2 7s2

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.