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1. Total number of valence electron from all the atoms in the molecule.
Wrong. Check the valence electron of N and O.
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Correct. The total number of electron is
17
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Wrong. Check the valence electron of N and O. .
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2. Select the central atom:
Correct. Is the less electronegative atom. In this case
N
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Wrong. The central atom is the less electronegative atom.
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3. How many electrons are used to form single bonds?:
Wrong. Two single bonds require more electrons.
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Correct. Two single bonds require
4 electrons.
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4. How many electrons are needed to complete the valence shell of the terminal atoms?.
Wrong. Four additional electrons to each terminal atom do not complete the octetos.
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Wrong. Five additional electrons to each terminal atom do not complete the octetos.
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Correct. Each O atom shares 2 electrons with N.
Six more electrons will complete the octeto.
Total 12
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5. How many electrons are needed to complete the octeto of the central atom?
Wrong. The N atom shares four electrons with the oxygen atoms.
Two more electrons do not complete the octeto.
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Wrong. The N atom shares four electrons with the oxygen atoms.
Three more electrons do not complete the octeto.
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Correct. The N atom already shares four electrons with the oxygen atoms.
Needs four more electrons to complete the octeto. However there is only one additional electron available that is added to N
and at the same time N shares an electron pair from the oxygens to reach 7 electrons environment.
Final structure
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6. What property has NO2 due to its 7 electron environment?
Wrong. NO2 (O.E.=4) in water oxidizes to
NO3-, (O.E.=5) and reduces to NO2-.
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Correct. Two molecules of NO2
are bonded through the N atoms forming N2O4. This way N completes the octeto.
Dimerization
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