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Q.

Read carefully the following statements regarding the ions $N a^{+}, M g^{2 +}, F^{-} a n d O^{2 -}$
(I) All ions have same number of valence electrons.

(II) All ions belong to the elements of the same period of periodic table.

(III) All ions have same electronic configuration.

(IV) All ions have same numbers of electron shells

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a

I and II

b

I, II and III

c

I, III and IV

d

All are correct

answer is C.

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Detailed Solution

$N a^{+} = 2, 8$

$M g^{2 +} = 2, 8$

$F^{-} = 2, 8$

$O^{2 -} = 2, 8$ .

(I) All ions have same number of valence electrons.

(III) All ions have same electronic configuration.

(IV) All ions have same numbers of electron shells

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Read carefully the following statements regarding the ions Na+,Mg2+,F− and O2− (I) All ions have same number of valence electrons. (II) All ions belong to the elements of the same period of periodic table. (III) All ions have same electronic configuration. (IV) All ions have same numbers of electron shells