millsemily millsemily

21-01-2016
Chemistry

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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

Respuesta :

21-01-2016

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. :)

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