Question

Which of the following is a reasonable ground-state electron configuration?

1s22s22p63s23p64s24d4
1s21p62s22p3
1s22s22p63s23p64s23d1
1s22s22p43s2

Answer 1

Following Aufbau rule and Hund principle, the order of filling of the orbitals is this:


`1s^22s^22p^63s^23p^64s^23d^(10)...`

So, the first, second, and fourth option are not correct.

The third option does meet the filling order.

Answer:
`1s^22s^22p^63s^23p^64s^23d^1`