Match the following: List - I List - II (P) Same number of unpaired electrons are present in (excluding zero) (1) Na + , Mg 2 + , F − (Q) Same number of electrons in s subshells (2) F¯, Mg, O 2- (R) S

Question

Match the following: List - I List - II (P) Same number of unpaired electrons are present in (excluding zero) (1) Na + , Mg 2 + , F − (Q) Same number of electrons in s subshells (2) F¯, Mg, O 2- (R) Same number of electrons with the ℓ = 1 (3) Mg , Ne , O 2 − (S) Same number of total electrons (4) Li, Na, K (5) F, Cl, Br

TestHub · Accepted Answer

Question Explanation: Identify correct matches with given properties.

Concept: Apply concept of quantum no. and filling of electrons.

Solution: 1

• (P) Unpaired Electrons : Set (4) (Li, Na, K - ns¹ ) and (5) (F, Cl, Br - np⁵) both have exactly 1 unpaired electron.

• (Q) Same electron in s and p subshells : Set (1) contains isoelectronic ions (Na⁺ , Mg²⁺ , F^- ). They share the identical configuration 1s2 2s2 2p6, meaning they all have equal s (4) and p (6) counts relative to one another.

• (R) Same l = 1 (p) electrons : Sets (1), (2) and (3) all revolve around the stable sp⁶core. Every species listed in these options has exactly options has exactly 6 p-electrons.

• (S) Same Total Electrons : Set (1) is the only isoelectronic set (all have 10 electrons).

Final Answer: Option (C)

List - I	List - II
(P) Same number of unpaired electrons are present in (excluding zero)	(1) $Na^{+}, Mg^{2 +}, F^{-}$
(Q) Same number of electrons in s subshells	(2) F¯, Mg, O^2-
(R) Same number of electrons with the $ℓ = 1$	(3) $Mg, Ne, O^{2 -}$
(S) Same number of total electrons	(4) Li, Na, K
	(5) F, Cl, Br

Chemistry - Atomic Structure Question with Solution | TestHub

Options:

Doubts & Discussion