SSC MTS EXAM

Detailed explanation-1: -Hydrogen, oxygen and nitrogen are elements as each of them are made up of two identical atoms. Whereas water is made up of two hydrogen atoms and one oxygen atom, therefore it is not an element.

Detailed explanation-2: -Atoms join together to form molecules. A water molecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom. That’s why water is sometimes referred to as H2O.

Detailed explanation-3: -water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states. It is one of the most plentiful and essential of compounds.