Science, Chemistry

9th -

12thgrade

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Core Physics practice

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35 questions

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  • Multiple Choice
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    20 seconds
    1 pt
    The atomic number of an element is equal to the number of _________ in an atom.
    protons
    electrons
    neutrons
  • Multiple Choice
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    30 seconds
    1 pt
    The unified mass unit (u) is based on an isotope of which element?
    oxygen
    hydrogen
    carbon
    sulfur
  • Multiple Choice
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    30 seconds
    1 pt
    Isotopes are different from regular atoms because they have a different
    Mass
    Color
    Charge
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