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Reptile [31]
3 years ago
7

?

Chemistry
1 answer:
ASHA 777 [7]3 years ago
6 0

Because the 4s orbital is at a lower energy level.

The 4s orbital has a lower energy because it is more <em>penetrating</em> than a 3d orbital. A 4s electron can get closer the nucleus than a 3d electron, so it has a lower potential energy.

The other options are incorrect because they contradict the correct one.

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