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Physical Science

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Which one is incorrect?

a) Carbon is 1s^2 2s^2 3s^2
b) Sodium 1s^2 2s^2 2p^6 3s^1
c) Neon 1s^2 2s^2 2p^6
d) all are correct

I suggest you review this web page
and then develop a better understanding of what the elctron configurations mean. Clicking any element in that web page will take you to another page that tells you the electron configuration.

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