Assertion (A): Atoms combine chemically to form molecules.
Reason (R): Most of the atoms do not exist independently.

1. Both A and R are false​
2. Both A and R are true, but R is not the correct explanation of A​
3. Both A and R are true, and R is the correct explanation of A​
4. A is true but R is false​

Out of atoms and molecules, which exist independently.

All matter is made of small indivisible particles called atoms. Atoms, however, do not have an independent existence, in general. They generally exist in combination with other atoms in the form of molecules or ions. Molecules are thus, the smallest particles of various substances (elements or compounds) which have an independent existence. The number of atoms present in one molecule is called atomicity.

Answer the following questions after reading the paragraph.

(1) Write any specific name given the molecule containing the same atoms.

(2) Name two elements whose atoms exist independently.

(3) Atomicity of a molecule of sulphuric acid is

(a) 8 (b) 7 (c) 6 (d) 4

(4) Which of the following elements exhibits the atomicity of eight?

(a) Phosphorus (b) Sulphur (c) Boron (d) Oxygen

Assertion: Atom is the smallest portion of matter which can take part in chemical combination.

Reason: Atoms of all elements can exist independently.

Which can exist independently - atoms or molecules?