Atomic Structure Basics
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Questions and Answers

What is the definition of an atom?

  • A unit of measurement for elements
  • A combination of different subatomic particles
  • The smallest unit of matter that still holds the properties of an element (correct)
  • A type of matter that has mass and takes up space

    • How many elements are there in total?

  • 200
  • 118 (correct)
  • 50
  • 10

    • What is the approximate size of an atom?

  • $10^{-2}$ meters
  • $10^{-5}$ meters
  • $10^{3}$ meters
  • $10^{-10}$ meters (correct)

    • Which subatomic particle is positively charged?

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

    What is the mass of a proton in atomic mass units (amu)?

    <p>$1$ amu</p> Signup and view all the answers

    How many main types of subatomic particles are there?

    <p>3</p> Signup and view all the answers

    Why are atomic mass units (amu) used to measure subatomic particles?

    <p>Grams are not practical for measuring such small particles</p> Signup and view all the answers

    What defines an atom as a specific element?

    <p>Number of protons</p> Signup and view all the answers

    Which subatomic particle has a negative charge?

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

    What type of bond is formed when two atoms share electrons?

    <p>Covalent bond</p> Signup and view all the answers

    Which subatomic particle's number can change during nuclear reactions?

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

    What is the total mass of an atom equal to?

    <p>Number of neutrons multiplied by the number of protons</p> Signup and view all the answers

    Which subatomic particle is located in the nucleus and has no charge?

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

    What do atoms with a different number of neutrons than average become known as?

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

    What determines an element's position in the periodic table?

    <p>Atomic number</p> Signup and view all the answers

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