Chemistry

9th -

12thgrade

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How Atoms Differ

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10 questions

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  • 1. Multiple Choice
    1 minute
    1 pt

    Why are all atomic masses not nearly whole numbers?

    This is due to the mass of all the electrons in the atom.

    This is because of experimental error.

    This is because atomic masses are the weighted average of the masses of all naturally-occurring isotopes.

    This is due to binding energy of the atoms.

  • 2. Multiple Choice
    1 minute
    1 pt

    The atomic number of an element is defined by its number of ________.

    protons

    neutrons

    electrons

    nuclei

  • 3. Multiple Choice
    1 minute
    1 pt

    The sum of the protons and neutrons in a nucleus is __________.

    the atomic number

    the mass number

    Avogadro's number

    the element number

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