Question

Which of the following is the electron configuration for an electrically neutral atom of beryllium(Be)?
1s^2 2s^2

1s2^2s2^2p^6

1s^22s^22p^4

1s^22s^22p^44d^2

Answer 1

1s^2 2s^2 is the electron configuration for an electrically neutral atom of beryllium(Be).

Answer 2

Answer: The correct answer is $1s^22s^2$

Explanation:

Beryllium is the 4th element of the periodic table having 4 electrons around the nucleus of the atom.

This element belongs to Group 2 and period 2 of the periodic table.

The electronic configuration of electrically neutral beryllium atom is $1s^22s^2$

This atom has 2 valence electrons.

Hence, the correct answer is $1s^22s^2$