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    Protons and Neutrons in Nucleus

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    I need some help in determining the number of protons and the number of neutrons in the nucleus of the following atoms and the number of electrons in their first and quantum shells:
    10/5B 14/6C 3/2He 40/19K 16/8O

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    Solution Preview

    The top number indicates the number of protons and neutrons. It's called the mass number. The bottom number refers to the number of protons only. That's called the atomic number. Therefore, if you subtract the two numbers, you can come up with the number of neutrons.

    For example, for ...

    Solution Summary

    This solution defines important concepts like mass number and atomic number, and also determines the number of protons and neutrons in the nucleus of the mentioned atoms.