Which statement correctly describes the arrangement of electrons in a sodium atom (atomic number 11)?
2 electrons in the first shell, 8 in the second shell, and 1 in the third shell
2 )
1 electron in the first shell, 10 in the second shell
3 )
8 electrons in the first shell, 2 in the second shell, and 1 in the third shell
4 )
2 electrons in the first shell and 9 in the second shell
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