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Ca has 2 electrons in its outermost shell its configuration being 2, 8,8,2 or

1s2, 2s2, 2p6, 3s2 3p6, 4s2

(4s2 fills before 3d becuase of the aufbau principle)

He has also got two electrons these fill the first energy level resulting in a stable arrangement.

1s2

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Q: How many electrons are in the outer shell of yhe Ca and He atoms?
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