Question

BRAINLIESTTT ASAP! PLEASE HELP ME :)

Answer 1

Answer: A ) 1s22s22p63s2 is a reasonable ground-state electron configuration

Answer 2

Answer: The correct ground-state electron configuration:

$1s^22s^22p^63s^2$

Explanation:

According to Aufbau rule :

The electron will first enter in the orbital with the lowest energy and after occupying the orbital with lower energy is goes top higher energy orbital.

The energy of the orbital is given by: (n+l)

For example: 1 s =(1+0) = 1, 2s = 2 + 0 = 2, 2p = 2 + 1= 3 etc.

So, the order of the orbitals with increase in energy is:

1s<2s< 2p<3s<3p <4s <3d<4p<5s<4d<5p<6s<4f< 5d<6p<7s<5f<6d<7p ....so on.

So, from the given option the correct ground-state electron configuration:

$1s^22s^22p^63s^2$