Atomic Number and Mass Number
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Questions and Answers

What is the total number of protons and neutrons in a sodium atom?

  • 10
  • 11
  • 22
  • 23 (correct)

    • If an atom has a mass number of 40 and an atomic number of 18, how many neutrons does it have?

  • 58 (correct)
  • 18
  • 22
  • 40

    • In an atom, if the number of electrons is 20, what is the most likely number of protons?

  • 19
  • 20 (correct)
  • 22
  • 21

    • Why do atoms have no overall electrical charge?

    <p>Because they have equal numbers of electrons and protons.</p> Signup and view all the answers

    If an atom has an atomic number of 8, how many electrons does it have?

    <p>8</p> Signup and view all the answers

    What is the significance of the mass number in an atom?

    <p>It indicates the total number of protons and neutrons in the atom.</p> Signup and view all the answers

    What defines the physical property of density?

    <p>The relationship between mass and volume of a substance</p> Signup and view all the answers

    Why are density measurements useful for identifying substances?

    <p>To distinguish substances based on mass and volume</p> Signup and view all the answers

    Which unit is commonly used to express mass?

    <p>Grams</p> Signup and view all the answers

    What is the formula for calculating density?

    <p>$Density = Mass/Volume$</p> Signup and view all the answers

    Why are feathers less dense than bricks?

    <p>Feathers have higher mass and occupy less volume</p> Signup and view all the answers

    What type of property is density known as?

    <p>Intensive property</p> Signup and view all the answers

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