Why does the mass number equal the total number of protons and neutrons? and what is mass number of atoms expressed in the Periodic table?

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01-09-2018
Chemistry

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Why does the mass number equal the total number of protons and neutrons? and what is mass number of atoms expressed in the Periodic table?

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jumana3 jumana3 · Answer 1 · 2018-09-01T11:03:22+02:00

jumana3 jumana3

01-09-2018

The mass number is equal to the number of protons plus the number of neutrons. From the periodic table, we can see that chromium has an atomic number of 24, which means its nucleus contains 24 protons. ... Therefore, the chromium-52 isotope contains 28 neutrons in its nucleus.

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