MHT CET 2024 Chemistry question

Chemistry Structure of Atom MHT CET 2024

Which of the following species contain 20 electrons?

(A)
(B)CaCorrect
(C)Mg
(D)Cl

Answer: (B)

Solution

Count electrons in each species. : K has Z = 19, losing one electron gives 18 electrons. Ca: Z = 20, neutral atom has 20 electrons. Mg: Z = 12, so 12 electrons. Cl: Z = 17, so

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Question ID VK-099842