Question

Which of the following is a correct statement in regard to the
Aufbau principle?
O (n-1)d subshell is always lower in energy than ns subshell
O (n-1)d subshell always has more energy than ns subshell
O 5d is lower in energy than 4d
O 5f is lower in energy than 7s​

Answer 1

option 3.

hope it is correct

Answer 2

Answer:

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number 3 is correctly