Question

in transition elements, the shells that are incompletely filled are penultimate or ultimate shells​

Answer 1

Answer:

Hence, in Ni, the ultimate and the penultimate shells are incompletely filled. The electronic configurations of zinc, cadmium and mercury (penultimate and ultimate shells) are (n−1)s2p6d10,ns2.

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Answer 2

Answer:

The shells that are incompletely filled in transition elements are both penultimate shells and ultimate shells

Explanation:

• Penultimate shells are those which are filled just before the valence shell
• The ultimate shell is just another name for the valence shell
• In transition elements, both penultimate and ultimate shells are partially filled
• For example, Chromium is a transition element
• The electronic configuration of Chromium is [Ar] 3d⁵ 4s¹
• The 3d shell has a capacity of 10 electrons, but in chromium, only 4 electrons occupy the shell
• The 3d shell is the penultimate shell
• The 4s shell has a capacity of 2 electrons, but in chromium, only 1 electron occupies the shell
• The 4s shell is the ultimate shell

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