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What happens to chromium that makes it an exception to the order of filling orbitals?
Wiki User
∙ 12y ago
Chromium is an exception to the electron configuration pattern because electrons will occupy subshells until half-full and THEN start pairing up. We would expect chromium to follow the trend after Vanadium:
V 'Ar' 3d3 4s2- All the subshells are either full or half full (or empty)
Cr 'Ar' 3d4 4s2- this is the configuration expected- but this is less STABLE for the atom.
The true configuration is:
Cr 'Ar' 3d5 4s2
This is so the d block is completely half full as is the s block meaning it is more stable. This links with the fact that electrons occupy subshells until half full and THEN start pairing up.
Wiki User
∙ 12y ago
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