Arrange these atoms and ions in order of decreasing size :

$M g^{2 +}, C a^{2 +}$ and Ca

C a > C a^{2 +} > M g^{2 +}

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C a^{2 +} > C a > M g^{2 +}

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M g^{2 +} > C a > C a^{2 +}

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C a > M g^{2 +} > C a^{2 +}

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Solution

The correct option is A $C a > C a^{2 +} > M g^{2 +}$
Cations are smaller than their parent atoms and hence, $C a^{2 +}$ is smaller than the $C a$ atom.

Down the group, atomic size increases. $C a$ is below $M g$ in group IIA of the periodic table, $C a^{2 +}$ is larger than $M g^{2 +}$ .

Therefore, $C a > C a^{2 +} > M g^{2 +}$ .
Hence, option $(A)$ is correct.

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Arrange these atoms and ions in order of decreasing size : Mg2+,Ca2+ and Ca

The correct option is A Ca>Ca2+>Mg2+Cations are smaller than their parent atoms and hence, Ca2+ is smaller than the Ca atom.Down the group, atomic size increases. Ca is below Mg in group IIA of the periodic table, Ca2+ is larger than Mg2+. Therefore, Ca>Ca2+>Mg2+.Hence, option (A) is correct.

Arrange these atoms and ions in order of decreasing size :

$M g^{2 +}, C a^{2 +}$ and Ca