First and foremost, they are completely different substances with each exhibiting unique properties. Both have different atoms involved on their structures which is the cause of the differing properties.
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2.5 x 10^24 molecules of C4H10
You can tell them apart from its form.
If it forms loose and needs like a container to hold it up, that's liquid.
If it is hard and stable, definitely a solid.
And if you barely see something very loose (and normally goes up), that's liquid.
True. Cs is metal, Cl is nonmetal, the difference in electronegativities is high enough to form ionic bond.