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Question

Calcium atom attains the electronic configuration of by losing two electrons from its valence shell.

A
neon
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B
argon
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C
helium
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Solution

The correct option is A neon
The atomic number of Ca is 20, i.e., it contains 20 electrons and hence, the electronic configuration is 2, 8, 8, 2.
By losing two electrons from its valence shell (outermost shell), it attains the electronic configuration of nearest noble gas - neon (atomic number -18).

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