kymy_rose00 Group Title The atomic number of chlorine is 17. Give the electron configuration for a neutral atom of chlorine. (How do I do this) one year ago one year ago

1. saifoo.khan

Do you know how to use this?

Atomic number of Strontium = 38 Electronic configuration of Sr = (2, 8, 18, 8, 2) ==> Sr has 2 electrons in outer valence shell, and it would like to lose these 2 electrons and convert itself to a stable octet. ==> Charge of Sr = +2 Atomic number of Chlorine = 17 Electronic configuration of Cl = (2,8,7). ==> Cl has 7 electrons in outer valence shell, and it would like to gain 1 electron and convert itself to a stable octet. ==> Charge of Cl = -1 So, 1 Sr atom needs 2 Cl atoms and vice versa :) ==> SrCl2 is the formula you need... :-) I hope i helped you...!

3. kymy_rose00

I dont understand

@SheldonEinstein @kymy_rose00 SheldonEinstein can help. Hes great at decsrribing processes.

5. kymy_rose00

ok thank you

The electron configuration for neutral Chlorine is 2.8.6.

7. Carl_Pham

Use the Periodic Table. 1. Chlorine is in Period 3, and the noble gas at the end of Period 2, just above, is neon. That gives you a noble gas core of [Ne]. 2. Cl is the 7th element in Period 3, so it will have 7 electrons outside of the noble gas core. 3. Before Cl, you have the 3s block (Na,Mg), so 2 of those 7 electrons will go into the 3s subshell: [Ne] 3s^2. 4. Cl is the 5th of the 6 elements in the 3p block, so the remaining 5 electrons will go into the 3p subshell: [Ne] 3s^2 3p^5. That's it. You can use the n+l rules if you like, but using the Periodic Table is much faster, and you're very likely to always have a PT with you, even on an exam.

Anytime!

This website surely should help, but @Carl_Pham explained it well. :)

11. kymy_rose00

The electron configuration for neutral Chlorine is 2.8.6.

13. Carl_Pham

The only thing you may need to keep in mind is how to divide the PT into blocks: |dw:1351276806726:dw| Keep in mind for this purpose we have to lump He in with H in the 1s block. Also that the p blocks start with 2p, and the d blocks start with 3d.

14. kymy_rose00

2.8.6?