Please help Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Which of the following correctly shows the electron arrangement for sodium? 2, 9 2, 8, 1 2, 8, 2 2, 9, 1

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asked Jan 26, 2017 62.6k views

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Please help Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Which of the following correctly shows the electron arrangement for sodium?

2, 9 2, 8, 1 2, 8, 2 2, 9, 1

Chemistry
high-school

Carson Pun asked

by Carson Pun

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1 Answer

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2,8,1
It's in group 1, so its outershell only has 1 electron, and the other shells are completely filled, so 2 then 8. :)

Mikeplate answered Feb 1, 2017

by Mikeplate

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