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QUESTION

# What is the mass number of oxygen?

That depends on the isotope of oxygen.

("A") is the sum of the "(Z"), which is the number of protons, and neutrons ("N") in the nucleus of a specific isotope of an element ("A=Z+N"). are named for their mass numbers. Oxygen has three naturally occurring isotopes.

The most common isotope of oxygen has 8 neutrons. Its atomic number is 8.

"A=Z+N" "A=8+8=16" This isotope of oxygen is oxygen-16.

Another isotope of oxygen has 9 neutrons. "A=8+9=17" This isotope is oxygen-17.

A third oxygen isotope has 10 neutrons. "A=8+10=18" This oxygen isotope is oxygen-18.

The following is the isotopic or nuclear notation of an isotope.