Write the electronic configuration of chromium and copper:

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Solution

Electronic configuration of Chromium, with atomic number $24 = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{5}$ .
Electronic configuration of Copper, with atomic number $29 = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{10}$ .

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(Z = 24)

_{24} C r - [A r] 3 d^{5} 4 s^{1}

_{29} C u - [A r] 3 d^{10} 4 s^{1}

The ground state electronic configuration of chromium atom is:

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