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Need help for the last questions!

Need help for the last questions!-example-1
User Leyu
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Potassium ion (K+) ; 18 e- = [Ar]
Highest noble Gas is [Ar] at 18 e-
Neutral K is 19 e- with shorthand: [Ar] 4s1
eliminating an electron, eliminates 4s1 and makes it same configuration as Argon.


User Sir Hennihau
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