Complete these structures by adding dots as needed.?

Complete these structures by adding dots as needed.

This is hard to show but here is how you would determine these. NOTE each dot is an electron.
Question 1)
F-H
1) determine the valance electrons for each. F has 7 and H has 1
2) one electron from both F and H form the bond “-” which means that you still have 6 electrons to place around F and none to place around H. Place the 6 in sets of 2 around the F
..
F-H
¨
Question 2)

2) H-O-H
H has 1 valence electron minus 1 used in the bond to O = 0 electrons to place
H has 1 valence electron minus 1 used in the bond to O = 0 electrons to place
O has 6 valence electrons minus 2 used in the bonds to the H’s = 4 electrons to place

H-O-H: place two dots above and below the oxygen

Question 3)
3) O=N—-H : NOTE: a double bond requires O and N to share two of their electrons each
O has 6 valence electrons minus 2 used in the bonds to N = 4 electrons to place
N has 5 valence electrons minus 3 used in the bonds to O and H = 2 electrons to place
H has 1 valence electron minus 1 used in the bond to N = 0 electrons to place
place the 2 dots on top and bottom of oxygen.
place 2 above the N

hope that helps
dnadan1

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