WHICH OF THE FOLLOWING SUBSHELL HAS MAXIMUM ENERGY 1) 4f 2) 6s 3) 3d 4) 1s

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Q. Write the following in increasing energy orders : 3d, 5s, 6s, 4f, 4d

Q. The

+ 3

ion of which one of the following has half-filled

4 f

subshell?

The +3 ion of which one of the following has half filled 4f subshell:

Q. The electronic configuration of four elements are:

(i) [X e] {6 s}^{1}

(i i) [X e] {4 f}^{14}, {5 d}^{1} {6 s}^{2}

(i i i) [A r] {4 s}^{2} {4 p}^{3}

(i v) [A r] {3 d}^{7}, {4 s}^{2}

Which one of the following statements about these elements is not correct?

The subshell 4s has the smaller energy than the subshell 3d.But the subshell configuration of Cr is 1s² 2s²2p⁶3s²3p⁶ 3d⁵4s¹.why did 3d came 1^stand 4s after it ???

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