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Chemistry, 29.01.2020 03:53 MayFlowers
An atom has an atomic number of 9 a mass number of 19 and an electron configuration of 2-6-1 explain why the number of electrons in the second and third shells shows that this is in an excited state
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An atom has an atomic number of 9 a mass number of 19 and an electron configuration of 2-6-1 explain...
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