Which atoms have $"4 valence electrons?"$ $"A. carbon and silicon"$ $"B. boron and argon"$ $"C. aluminum and calcium;"$ $"D. potassium and magnesium;"$ $"E. none of the above."$

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Which atoms have $"4 valence electrons?"$ $"A. carbon and silicon"$ $"B. boron and argon"$ $"C. aluminum and calcium;"$ $"D. potassium and magnesium;"$ $"E. none of the above."$

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Answer 1 · 2017-06-13T06:25:25

$"Answer A.............."$

Explanation:

$"Carbon"$ and $"silicon"$ BOTH come from $"Group 14"$ of the $"Periodic Table"$ , i.e. both formally have the same number of valence electrons, 4 such electrons.........

On the other hand, $"boron"$ , and $"argon"$ have 3 and 8 valence electrons respectively.

$"Aluminum"$ and $"calcium"$ have 3 and 2 valence electrons respectively.

And $"potassium"$ and $"magnesium"$ , have 1 and 2 such electrons.

And if you are doing your chemistry homework, there SHOULD be a Periodic Table in front, that graphically gives you the electronic structure. Is there? And if it is there you still have to learn how to use it effectively.

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Which atoms have $"4 valence electrons?"$ $"A. carbon and silicon"$ $"B. boron and argon"$ $"C. aluminum and calcium;"$ $"D. potassium and magnesium;"$ $"E. none of the above."$

1 Answer

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