Chemistry: Atomic Structure and Elements
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Chemistry: Atomic Structure and Elements

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Questions and Answers

What is the definition of a chemical element?

  • A collection of atoms that have the same number of electrons in their nucleus
  • A collection of atoms that have the same atomic mass
  • A collection of atoms that have the same number of protons in their nucleus (correct)
  • A collection of atoms that have the same number of neutrons in their nucleus
  • How are the elements arranged in the Periodic Table?

  • In periods (rows) and groups (columns) based on their atomic number (correct)
  • In alphabetical order by their chemical symbol
  • In random order with no specific pattern
  • In order of increasing atomic mass
  • What is the number of protons in an atom's nucleus known as?

  • Atomic Number (correct)
  • Electron Number
  • Proton Number
  • Atomic Mass
  • Where are the metals located in the Periodic Table?

    <p>Bottom left corner</p> Signup and view all the answers

    How many chemical elements are compiled in the Periodic Table of elements?

    <p>118</p> Signup and view all the answers

    What did Dmitri Mendeleev use to observe periodic trends and similarities in grouping elements?

    <p>Physical properties</p> Signup and view all the answers

    What type of change involves the breaking and forming of bonds, resulting in a transfer of energy?

    <p>Chemical change</p> Signup and view all the answers

    What do elements in the same group of the Periodic Table possess?

    <p>Common physical and chemical properties</p> Signup and view all the answers

    What is the term for a substance that speeds up the rate of a chemical reaction?

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

    What is the term for a chemical reaction that releases energy?

    <p>Exothermic reaction</p> Signup and view all the answers

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