Question

Which is outermost orbital 3d or 4s?

Answer 1

Answer:

4s orbital have higher energy than 3d so answer is the 4s

Answer 2

Answer:

In all the chemistry of the transition elements, the 4s orbital behaves as the outermost, highest energy orbital. The reversed order of the 3d and 4s orbitals only seems to apply to building the atom up in the first place. In all other respects, the 4s electrons are always the electrons you need to think about first

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