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Electronic Configuration of Actinides

Why chromium ...

Question

Why chromium has electronic configuration $3 d^{5} 4 s^{1}$ and not $3 d^{4} 4 s^{2}$ ?
Transition metals form complex compounds :

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Solution

$C r = 24$
Now $C r$ can have $4 s^{2} 3 d^{4}$ or $4 s^{2} 3 d^{5}$

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Similar questions

Q. Which rule explains the electronic configuration of chromium is [Ar]

3 d^{5} 4 s^{1}

instead of [Ar]

3 d^{4} 4 s^{2}

?

Q. Which one of the following (a or b) electronic configuration is more stable and why?
(a)

3 d^{4} 4 s^{2}

3 d^{5} 4 s^{1}

Q. Explain why transition metals form complex compounds.

State True or False.

The outer electronic configuration of the ground state chromium atom is

3 d^{4} 4 s^{2}

.

Q. The configuration of

C r

3 d^{5} 4 s^{1}

3 d^{4} 4 s^{2}

R_{1}

and the configuration of

C u

3 d^{10} 4 s^{1}

3 d^{9} 4 s^{2}

R_{2}

R_{1}

R_{2}

are_____________.

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