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  • Need clarity, kindly explain! 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. Thecorrectoption is:

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

  • Option 1)

    5f > 6p > 5p > 4d

  • Option 2)

    6p > 5f > 5p > 4d

  • Option 3)

    6p > 5f > 4d > 5p

  • Option 4)

    5f > 6p > 4d > 5p

Answers (1)

best_answer

Option 1

                            \underset{\downarrow}{5f}\;\;\; > \;\;\;\underset{\downarrow}{6p}> \;\;\;\underset{\downarrow}{5p} \;\;\;>\;\;\; \underset{\downarrow}{4d}

\underset{\textup{value}}{(n+l)} =      5 + 3             6 + 1         5 + 1             4 + 2

                              8                   7                6                   6

Energy of various orbitals are compared with (n+l) rule. The orbitals having a lower value of (n+l) have lower energy.

If the value of (n+l) is same for two orbitals, then orbital with a lower value of 'n' would have lower energy and filled first.


Option 1)

5f > 6p > 5p > 4d

Option 2)

6p > 5f > 5p > 4d

Option 3)

6p > 5f > 4d > 5p

Option 4)

5f > 6p > 4d > 5p

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