Question
Asked Sep 18, 2019
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In my chemistry class we are doing Electron configurations 

I understand the complete notation, I just don't understand how to do the noble gas notation. 

Fe 

Complete: 1s2 2s2 2p6 3s2 3p6 4s2 3d6 

Noble Gas: ?

 

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Step 1

Given,

The given electronic configuration is 1s22s22p63s23p64s23d...

The given electronic configuration of Fe is s22s22p 3s23p64s23d6 and it is abbreviated as
[Ar] 3d 4s2
The electronic configuration of argon is 1s22s22p°3s23p0
Therefore, instead of writing 1s 2s 2p° 3s 3p°, we can write as [Ar]
Noble gases are completely filled orbital and they are inner
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The given electronic configuration of Fe is s22s22p 3s23p64s23d6 and it is abbreviated as [Ar] 3d 4s2 The electronic configuration of argon is 1s22s22p°3s23p0 Therefore, instead of writing 1s 2s 2p° 3s 3p°, we can write as [Ar] Noble gases are completely filled orbital and they are inner

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