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Answer. 4s

Ca = Calcium Atomic number is 20, that means it has 20 proton and 20 electron.

1s2,2s2,2p6,3s2,3p6,and 4s2, total of 20 electrons, therefore Highest occupied energy level of Ca is 4s

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12y ago
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14y ago

Carbon's highest energy level is the second, more particularly the 2p orbital.

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12y ago

2p

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