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Question

Calcium has $$20$$ electrons. How many electrons are in the outer shell?

Solution
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$$2$$
Explanation:
Electronic configuration of $$_{20}Ca$$ is
$$1s^22s^22p^63s^23p^6\underbrace {4s^2}$$
Number of electron in outermost shell $$(4^{th}$$ shell) is $$2$$

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