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Electron configuration is the arrangement of electrons in an atom. There are four blocks in the Periodic Table: S, P, D, F. Block S is groups 1 and 2. Block P is groups 13-18. Block D is groups 3-12. And block F is the lanthanides and actinides. There are several exceptions, for example He is considered part of S block even though it is over group 18. Here are some examples:

He - 1S2

Al - 1S22S22P1

Ni - 1S22S22P63S23P64D8

Shorthand form uses the noble gases (group 18). Whatever element you are using, go to the closest noble gas. For example:

Ca - [Ar] 4S2

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Q: Why does the shorthand form for electron configuration convey?
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