Respuesta :

gaciatamuguna

Answer:

2:8:7

Explanation:

The first shell can accommodate a maximum of 2 electrons, while the second level accommodates a maximum of 8 while the third last cell takes up the remaining 7 electrons

MamaAP
The electron configuration would be:

1s^2 2s^2 2p^6 3s^2 3p^5

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