Question

$\text{Statement-I:}$ Shielding is effective when the orbitals in the inner shells are completely filled.
$\text{Statement-II}$ Across $3^{\text{rd}}$ period, nuclear charge outweighs the shielding.
In the light of the above statements, choose the correct answer from the options given below.

• A. Statement-I is true but statement-ll is false
• B. Both the statement-I and statement-ll are false
• C. Both the statement-I and statement-ll are true
• D. Statement-l is false but statement-Il is true

Answer 1

The correct option is C Both the statement-I and statement-ll are true

Answer (2)
$\bullet$ If inner shell orbitals are completely filled then the shielding is more effective.
$\bullet$ Size decreases gradually in $3^{rd}$ period as the nuclear charge outweighs the shielding.