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I want to refers C, N, O, P

Should I say "all of them have no allotropes" or "all of it has no allotropes?"

What's the difference? (Can I say : what's the differences?)

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You should say "all of them", because the collection {C,N,O,P} doesn't have a name. So you can't refer to the set as an it yet.

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  • Whats the differences ? True or not? – Lifeforbetter Feb 28 at 19:44
  • If it's 1 thing that's different between X and Y, you can say difference, If it's >1 thing that's different between X and Y, you can say differences. The number of X and Y doesn't change whether you say difference or differences. – LawrenceC Feb 28 at 19:46
  • What is the differences is true? – Lifeforbetter Feb 28 at 19:54
  • Or what are the differences? – Lifeforbetter Feb 28 at 20:07

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