Assertion: Shielding effect increases as we go down the group. Reason: More is the number of electrons in the penultimate shell, more is the shielding.

Question

Assertion: Shielding effect increases as we go down the group. Reason: More is the number of electrons in the penultimate shell, more is the shielding. (A) If both assertion and reason are true and reason is the correct explanation of assertion. (B) If both assertion and reason are true but reason is not the correct explanation of assertion. (C) If assertion is true but reason is false. (D) If both assertion and reason are false.

Tardigrade Admin · Accepted Answer

Complete electron shells shield the nuclear charge very effectively. On moving down the group, the number of complete electron shells increases. Also, the nuclear core is farther removed from the valence electrons.

Q. Assertion: Shielding effect increases as we go down the group. Reason : More is the number of electrons in the penultimate shell, more is the shielding.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

Complete electron shells shield the nuclear charge very effectively. On moving down the group, the number of complete electron shells increases. Also, the nuclear core is farther removed from the valence electrons.

Q. Assertion: Shielding effect increases as we go down the group.
Reason : More is the number of electrons in the penultimate shell, more is the shielding.