Which one of the following has the same number of electrons as $C a^{2 +}$ ?

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Solution

The correct option is A Ar
Ar has the same number of electrons as $C a^{2 +}$ . These are isoelectronic species.
The atomic number of Ar is 18. It contains 18 electrons. The atomic number of Ca is 20. It contains 20 electrons.
It loses 2 electrons to form $C a^{2 +}$ ion with 18 electrons.

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