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[Kr] 5s1 4d5

Mo is an exception to the usual rules of electron configuration. You would think that the configuration would be


[Kr] 5s2 4d4


But Mo is more stable with and extra electron in it's d orbital, rather than it's s orbital.

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15y ago

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What is the noble gas configuration for molybdenum?

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If it is an element, it could be either chromium (Cr) or molybdenum (Mo). You need to know more to know which. The electronic configuration for Cr is:[Ar]3d54s1and for Mo it is[Kr]4d55s1So both elements have 5 d-electrons and 1 s-electron. I'm not sure if that what you mean however by "s1d5"...


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The trivalent ion with the electron configuration of Kr 4d^3 is the Yttrium (Y^3+) ion. Yttrium differs from krypton (Kr) by losing three electrons to achieve the electron configuration of Kr 4d^3.


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