Answer 1 is false. Lewis structures by definition only show valence electrons.
Answer 2 is false. Valence electrons will nearly always be involved in bonding, and as mentioned above, Lewis structures show only valence electrons. There are cases where valence electrons don't bond, but that does not mean that they never do.
Answer 3 is false. Consider the Lewis structure for
If you had to show every single electron for each participating atom on there, you would have an additional 8 electrons around phosphorus. Remember: Lewis dot diagrams show only valence electrons.
Answer 4 is true.
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