GENERAL KNOWLEDGE

Detailed explanation-1: -Answer: Solution: An element is a pure substance made up of identical atoms.

Detailed explanation-2: -An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.

Detailed explanation-3: -Pure substances are mostly homogeneous in nature containing only one type of atom or molecule. These substances mainly have a constant or uniform composition throughout.

Detailed explanation-4: -A molecule may be homonuclear, that is, it consists of atoms of one chemical element, e.g. two atoms in the oxygen molecule (O2); or it may be heteronuclear, a chemical compound composed of more than one element, e.g. water (two hydrogen atoms and one oxygen atom; H2O).

Detailed explanation-5: -Elements, made of a single kind of atom, are pure substances that cannot be broken down into any other substances by chemical or physical means. Only a few elements exist in nature as pure elements. Examples include nitrogen gas (N 2 )oxygen gas (O 2 ) gold (Au ), carbon (C ), silver (Ag ), and copper (Cu ).