Salt, silt, and clay particles
Tar pits.
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You can determine this by counting the number of electrons on the last orbital. If the number of electrons on the last orbital (valence electrons) is 8 then it satisfies the octet rule because the compound has mirrored the look of a noble gass or “neutral” charge.
Explanation:
I'm pretty sure 1. yes 2. no and 3. it might be yes but I'd just put a maybe