How do you write the noble-gas electron configuration for potassium?

1 Answer
anor277
May 30, 2018

#"Electronic configuration of potassium"-=[Ar]4s^1#

Explanation:

For #"potassium"#, #Z=19#....and so for the full electronic configuration we write...

#1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^1#

But we can abridge this slightly...

#underbrace(1s^(2)2s^(2)2p^(6)3s^(2)3p^(6))_"configuration of argon, Z=18"4s^1#

And finally we get...#...K:[Ar]4s^1....#

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