1s2 2s2 2p6 3s2 3p6 is the electron configuration for

Argon (Ar)

Explanation:

The reason why it is Argon is because when you add the electrons 2+2+6+2+6, there will be 18 electrons total and the number 18 is also from the atomic number. I just learned this a while ago and remembered how to do it since you need help with this. I hope this helps and have a good day!

iron and sleel

make siroeel

i would say b

explanation:

but i think i would need more information than that