Question

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?

Answer 1

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!