The atomic number of chromium is 24 Its electronic coefigueration in ground state in 1s22s22p63s24s13d5 .Chromium atom by using 3 electron from Cr2+ .A chromium atom contain 17% morte neutron than the proton. Now answer the following questionsThe number of occupied sub- shell in Cr3+ ion is (1) 3 (2) 6 (3) 5 (4) 1

Answer: (1)

The atomic number of chromium = 24.

The electronic configuration in the ground state is

Cr (Z = 24) = 1s2, 2s2 2p6 3s2 3p6 4s1 3d5.

The electronic configuration of cr3+ is

cr3+ = 1s2, 2s2 2p6 3s2 3p6 4s0 3d3.

There are three unpaired electrons present in the 3d subshell.

The number of unpaired electrons in Cr3+ ions is = 3.

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