The short hand notation $3 d^{5} 4 s^{1}$ stands for element :

C d

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C u

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F e

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C r

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Solution

The correct option is D $C r$
The short hand notation $3 d^{5} 4 s^{1}$ stands for chromium. It belongs to 3d series of periodic table.

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For the four successive transition elements (Cr, Mn, Fe and Co), what is the order of stability of their +2 states?

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