Which of the following are likely to form a covalent bond ? silver atoms , argon atoms, sodium and chlorine atoms, carbon and chlorine atoms

Carbon and Chlorine are likely to form a covalent bond.

Explanation:

Covalent bond is formed when two atoms share their electrons to complete their octet and achieve inert configuration. Covalent bonds are formed  between two non metals with similar electronegativities that are unable to fully donate electrons.

Generally, two nonmetals form covalent bond, a metal and a nonmetal form ionic bond and two metals form metallic bonds.

the role of the microscope world in creating new materials .

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.