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US History

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41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons.

This is what I got-
Protons: 19
Neutrons: 20
Electrons: ?

Thanks
-MC

  • Chemistry - ,

    **Not US History, haha

    -MC

  • electrons - ,

    The electrons must be the same as the protons, or, Lord help us, each atom would be repulsively charged.

  • Chemistry - ,

    So..19, right?

    Thanks!
    -MC

  • US History - ,

    yes, 19

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