millsemily millsemily

21-01-2016
Chemistry

Answered

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

Verified Answer :

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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