Can someone please determine the electronic configuration and the group number for the following atomic numbers (Use TM to represent transition metals if necessary): 5, 15, 26 and 34?

1 Answer

Atomic number 5 is boron, 15 is phosphorus, 26 is (TM) iron and 34 is selenium.

Explanation:

I'll give you the ground state electronic configuration.
Group 3 - Boron: #1s^2 2s^2 2p^1#
Group 15 - Phosphorus: #1s^2 2s^2 2p^6 3s^2 3p^3#
Group 8 - (TM) Iron: #1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 4s^2#
Group 16 - Selenium: #1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^4#

Do refer to a periodic table and I hope this helps!