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What are atoms with the same number of protons but different number of of neutrons called?

Answer 1

#"Isotopes"#

For the isotopes of hydrogen see this answer. Most elements possess several isotopes, some of which may be especially useful for spectroscopic analysis. The use of #""^13C# in NMR spectroscopy, and #""^13C# is an isotope that has an abundance of only #1%#, is now widespread and routine in organic chemistry.

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Answer 2

Cameron Andrews

Isotopes are atoms that have the same number of protons but differ in the number of neutrons.

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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.