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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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12y ago
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1mo ago

There are 2 electrons in the outer shell of a helium (He) atom. For calcium (Ca), there are 2 electrons in the first shell and 8 electrons in the second shell, so the outer shell has 2 electrons.

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