Match the following pairs Species (a) O^ 2- (b) Li^ 2+ (c) He (d) Ca^ ++ Number of electrons (i) 18 (ii) 2 (iii) 10 (iv) 1

MHT CET 2022 Chemistry question

Chemistry Structure of Atom MHT CET 2022

Match the following pairs Species (a) (b) (c) He (d) Number of electrons (i) 18 (ii) 2 (iii) 10 (iv) 1

(A)(a) – (i), (b) – (ii), (c) – (iv), (d) – (iii)
(B)(a) – (ii), (b) – (iii), (c) (i), (d) – (iv)
(C)(a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)Correct
(D)(a) – (iv), (b) – (i), (c) – (iii), (d) – (ii)

Answer: (C)

Solution

Count the electrons in each species. (a) : oxygen has 8 electrons and gains 2, so , which matches (iii). (b) : lithium has 3 electrons and loses 2, so , which matches (iv). (c) He: neutral helium () has 2 electrons, matching (ii). (d) :

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Question ID VK-093999