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Postby Ahmet_Dikyurt_3L » Wed Oct 24, 2018 12:10 pm

Is Helium in P-block or S-block? It appears on top of P-block with the noble gases, but has the electron configuration 1s2?

Kim Tran 1J
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Re: Helium

Postby Kim Tran 1J » Wed Oct 24, 2018 1:05 pm

Helium has the electron configuration 1s2 so it should belong to the s-block, but helium is placed with the p-block because helium is a noble gas (it has a full electron shell) so it is placed with the other noble gases in group 18. The periodic table is also sorted based on chemical properties, hence helium is placed with elements similar to it. So helium is sort of an exception.

Jamie Hsu
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Joined: Fri Sep 28, 2018 12:19 am

Re: Helium

Postby Jamie Hsu » Wed Oct 24, 2018 5:06 pm

Helium is part of the s block, not the p block. The electron configuration is 1s2, so even though it does appear on top of the p block when looking at the periodic table, it still belongs to the s block.

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