An atom in an excited state has an electron configuration of 2-7-2 Explain in terms of subatomic particles why this excited atom is electrically neutral

Respuesta :

I can said that this atom is in an excited state because the second level has 7 electrons in place of 8 electrons and may be one of the two electrons in the third level. I can't explain why this atom is electrically neutral without knowing the number of protons.

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