What is a rule for determining the mass number of an atom?

Answer 1

Xavier Avery

The mass number of an atom is determined by adding the number of protons and neutrons in its nucleus.

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Answer 2

Owen Ambrose

Mass number is the sum of the protons and neutrons in the atomic nucleus.

The mass number (#"A"#) is the sum of the atomic number (#"Z"#), which is the number of protons, and the number of neutrons (#"N"#) in the atomic nucleus of an isotope of an element. #"A=Z+N"#

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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.

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