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Chromium has atomic no. of 24.

Its electronic configuration is 1s22s22p63s23p64s13d5 .

It should be 4s23d4 but it is not because the half filled d-sub shell provides extra stability to chromium atom.

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13y ago
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14y ago

[Ar]4s13d5 is the configuration for chromium atom. It has this rather than two electrons in the 4s as it is more stable like this. When it forms 3+ it has the configuration [Ar]4s03d3 as the 4s will be lost first as they are at a lower energy level.

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6y ago

Chromium (Cr) has 24 electrons. Cr^3+ has lost 3 electrons so will have 21 electrons. Chromium is a transition metal, and so is a d-block element. The electron configuration would be 1s2 2s2 2p6 3s2 3p6 3d3 (note the 4s is not occupied because a HALF FILLED d orbital is more stable than a partially filled d orbital.

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9y ago

Chromium : 1s2 2s2 2p6 3s2 3p6 4s13d5 can be written as [Ar] 3d5 4s1

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11y ago

1s2 2s2 2p6 3s2 2p6 3s2 3p6 4s1 3d5

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15y ago

4s2 4p6 3d4

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11y ago

4d6

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Q: What is the complete electron configuration for the chromium III ion?
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