Which group tends to form +1 ions ?

Group 1, the alkali metals

Explanation:

Its because there's one valence electron in their outermost shell, they just lose that one electron and boom, they're stable. Losing electrons would create cations, so the loss of one electron creates +1 ions

the answer would be c

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.