Brainliestttme : )

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

1s21p5
1s22s22p8
1s22s22d4
1s22s22p6

1s22s22p6.

Explanation:

Electronic configuration may be defined as the distribution of electrons in their respective shell. The different orbitals in which the electrons filled are s, p, d, f and g orbitals.

The ground state electronic configuration includes the full filling of the maximum electrons. The s orbitals max have 2 electrons and p orbitals have 6 electrons. The electron filling first occur in s then in p. Hence, 1s22s22p6 shows the ground-state electron configuration.

Thus, the correct answer is option (4).