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Why do electrons fill the 4s orbital before they start to occupy the 3d orbital

Why do electrons fill the 4s orbital before they start to occupy the 3d orbital
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Why do electrons fill the 4s orbital before they start to occupy the 3d orbital

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User Neil Kelsey
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Answer:

Explanation: In 4s orbital has lower energy than 3d, so 4s orbits filled first.

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User Algeroth
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