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Standard XI
Chemistry
Group 1 Elements: Alkali Metals
Question
$$Ca^{2+} $$ is isoelectronic with
A
$$Mg^{2+} $$
B
$$Ba^{2+} $$
C
$$Ar$$
D
$$Na$$
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Solution
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Correct option is D. $$Ar$$
Answer is option (D)$$Ar$$
Atomic no. of $$ Ca = 20 $$
$$ Ca^{2+} = 1s^2 2s^2 2p^6 3s^2 3p^6 , Ar = 1s^2 2s^2 2p^6 3s^2 3p^6 $$
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