The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?

A. 11
B. 12
C. 23

talr2008-09-15T08:54:15Z

Favorite Answer

Mass number = number of nucleons (i.e. protons + neutrons), or in this case, 23.

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?2016-05-24T04:46:21Z

11 protons, 11 electrons and 12 neutrons. Why? Atomic mass is equal to the number of protons plus the number of neutrons. Atomic number is the number of protons present, and in every atom the number of protons and electrons MUST be equal! (Otherwise it's an ion!)

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Goethe's Ghostwriter2008-09-15T08:57:44Z

Na: 23

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bioteach2008-09-15T08:53:45Z

c. 23

The mass number is the number of protons and neutrons in the nucleus.

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