2.The element amongst common salt, carbon dioxide and hydrogen is

Hydrogen is a pure element, the other two are compounds.

Common table salt is sodium chloride (NaCl) and consists of the

elements sodium and chlorine. Carbon dioxide (CO2), as the name

implies, consists of the elements carbon and oxygen. Hydrogen (H2)

is a diatomic element.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.