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
anor277
Jun 13, 2017

#"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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