Which electron configuration represents an atom in an excited state

Asked by admin @ 15/10/2021 in Chemistry viewed by 304 People

Which electron configuration represents an

atom of magnesium in an excited state?
(1) 2–7–3 (3) 2–8–2
(2) 2–7–6 (4) 2–8–5

Answered by admin @ 15/10/2021

Atomic number of magnesium is 12. That implies that in ground state magnesium has 2 electrons in the first level, 8 electrons in the second level, and 2 electrons in the third level. That is represented by 2 8 2. That the atom is in an excited state means that one electron (at least) is a upper level than where it is in grounded state. That situation is represented by the option (1) 2 7 3, where one electron from the second level has been promoted to the third level.

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Asked by admin @ 12/08/2021 in Physics viewed by 263 persons

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