Question

The electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 represents which noble gas?


neon
argon
helium
krypton

Answer 1

@tomie2020 count the number of electrons in the superscript

\[1s ^{2} \] the 2 on top tells you that there are 2 electrons.

Answer 2

so 18 electrons

Answer 3

Now @tomie2020 that you have this number, 18 electrons all you need to do is go back to the periodic table and find what element has 18 electrons

Answer 4

seriously its that easy???? i feel dumb now but thanks so much for the help

Answer 5

yeah so what noble gas would it be @tomie2020 ? and also they gave you the electronic configuration, in the future you may have to find out the electronic configuration is that's a little bit harder though. you need to follow hunds rule, pauli's exclusion principle, and afbau principles.

Answer 6

it was argon

Answer 7

yep

Answer 8

Noble gases are important because they all have 8 valence electrons.

Answer 9

that means that they are un-reactive and stable generally, yet sometimes fluorine will react with them though, there are some exceptions to this

look at this compound Xenon a noble gas Xenon hexa-flouride

Answer 10

hope this helped you