Question

The following questions consist of two statements–Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.(3 × 1 = 3)

(i) Assertion (A) : Atom is quite stable.

Reason (R) : The electrons revolve in discrete orbits.

Answer 1

Answer:

reason is true but i am not quite sure with assertion because some atoms are stable and some are also unstable

Explanation:

Answer 2

The correct answer is option (a) Both A and R are true and R is the correct explanation of A.

Explanation:

• According to bohr, Atom is quite stable because The electrons revolve in discrete orbits.
• The model states that electrons in atoms move in circular orbits around a central nucleus and can only orbit stably in certain fixed circular orbits at a discrete set of distances from the nucleus.
• These orbits are associated with definite energies and are also called energy shells or energy levels.
• In an atom the number of protons in the nucleus is equal to the number of electrons out side the nucleus.
• Hence the positive and negative charges in the atom are equal. So, atom is stable.