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There are 8 electrons on the second energy level of argon. Every element in Group 1 on the period tables have 1 valence electron. In group 2, 2 valence electrons. Then it skips to 13 (remember it by forgetting the 1st digit). In group 13, there are 3 valence electrons. 14 - 4 valence, 15 - 5 valence, 16 - 6 valence, 17 - 7 valence, 18 - 8 valence.

Argon is in Group 18. It has 8 valence electrons and since it is in period 3, it has 3 electron energy levels. Since the noble gases are stable, that means no electrons are in the excited state. So there can't be more or less than 8 electrons in the second energy level. Because there are 4 available orbitals in the 2nd energy level (1 s sublevel orbital and 3 p sublevel orbitals), that means that all orbitals are filled (2 electrons to each orbital) and there are 8 electrons in all in the 2nd energy level of Argon.

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How many electrons does an argon atom have in each level?

An argon atom has 2 electrons in its first energy level, 8 electrons in its second energy level, and 8 electrons in its third energy level.


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