Question

elements in which last electron enter into penultimate shell
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Answer 1

Answer:

Penultimate” means “next to last”. The ultimate shell would be the highest-numbered occupied shell for a given atom, and the penultimate shell is the second-highest occupied shell. In the d-block elements, the d orbitals of the penultimate shell are being filled as you move across the block from left to right. For instance, in the 4th row, K has one electron in the 4s orbital and its 3d orbitals are empty. Ca has 2 electrons in the 4s orbital. Sc has 2 electrons in the 4s orbital and one in the 3d orbital. As you move further, electrons are added to the 3d orbital until it is completely filled with 10 electrons in Zn.

Answer 2

Explanation:

Every element have penultimate shell. It is second last shell after valence orbit.

So d block elements are the one where the 2 gets filled in valence while the other 10 goes in penultimate shell

Your answer is d block and f block elements