Electron configurations of noble gases.


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Explain how to do configuration on noble gases, for example krypton.
How do I figure out which element is represented by [Kr]5s^2 4d^10 5p^2


the electron configuration of the first noble gas is

He: 1s2

If we continue on to the next energy level we see

Li: 1s22s1

or we can write

Li : [He]2s1

now compare the three examples we have use the brackets [] to mean "the same electron configuration as"

we can shorten very long electron configuration of elements with many electrons by simply using the noble that it is just past on the periodic table.

Potassium is just past Argon.

So instead of writing the full electron configuration of K which is 1s12s22p63s23p64s1

I can greatly shorten this by saying "the same electron configuration as Argon"  [Ar] and 4s1

Hope that helps :)