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

neon

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argon

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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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Similar questions

Which element has :

(a) two shells, both of which are completely filled with electrons?

(b) the electronic configuration 2, 8, 2?

(d) a total of two shells, with three electrons in its valence shell?

(e) twice as many electrons in its second shell as its first shell?

6 s^{2}

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