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Can a molecule only contain one kind of atom?

Answer 1

#NO, NO_2, CO_2, CH_4, CO# are ALL GASEOUS molecules at normal temperatures and pressure.............

Do these species only have one kind of atom in them?

On the other hand, I could point to #N_2#, or #O_2#, or #O_3#, or #F_2#. These species are also molecular, and as elemental species they contain only the one element.

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Answer 2

Cooper Anderson

No, a molecule can contain atoms of different elements bonded together. These molecules are called compounds.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.