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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

NTA Abhyas 2020 · Chemistry · Classification of Elements and Periodicity in Properties

Which among the following species have the same number of electrons...

Which among the following species have the same number of electrons in its outermost as well as penultimate shell

Options

A ${Mg}^{2 +}$
B $O^{2 -}$
C $F^{-}$
D ${Ca}^{2 +}$

Correct answer

D. ${Ca}^{2 +}$

Step-by-step solution

{ }_{20}Ca = 2, 8, 8, 2

{Ca}^{2 +} = 2, 8, 8

Hence,

{Ca}^{2 +}

has

8

electrons each in outermost and penultimate shell.

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