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Among 3d, 4s, 4p orbitals, which one ...

Among 3d, 4s, 4p orbitals,
which one fills last by an electron? And why?

Text Solution

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4p' orbital fills last with electron. Even though '3d' and '4p' has equal energies, '4p-' has higher 'n' value (n = 4). So, `3d lt 4p`.
According to Aufbau principle '3d' is filled first, then only '4p' will be filled.
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