Question

using the following electronic configuration x = 1s2 2s2 2p6 3s2 3p5 state the group and period the atom belongs

Answer 1

Answer:

Group 7 (17), period 3, the atom with this electronic configuration is Chlorine.

Explanation:

You can count up the number of electrons:

1s2 -> 2 is the number of electrons, when we add up all the numbers, we get 17.

(the highest energy level of X is 3 => period 3, and number of electrons at the 3rd energy level is 7 => group 17 or 7