Question

Assertion : The energy of an electron is largely determined by its principal quantum number. 

Reason: The principal quantum number (n) is a measure of the most probable distance of finding the electrons around the nucleus.

(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 correct explanation of A  

(c) A is true but R is false  

(d) A and R are false

Answer 1

Correct option (a) Both A and R are true and R is the correct explanation of A  

Explanation:

Principal quantum number (n) represents the name, size and energy of shell to which the electron belongs. Higher the value of 'n' greater is the distance of the shell from the nucleus and hence greater is the energy.