Isotopes and Atomic Structure
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Questions and Answers

What is the electron configuration of the element with 10 electrons?

  • 1s2 2s1 2p7
  • 1s2 2s1 2p6 (correct)
  • 1s2 2s2 2p6
  • 1s2 2s2 2p5
  • How many valence electrons does an atom with the electron configuration 1s2 2s2 2p6 have?

  • 6
  • 8 (correct)
  • 10
  • 7
  • In which energy state would an electron configuration of 1s1 2s2 2p6 be considered?

  • Excited state
  • Elevated state
  • De-energized state
  • Ground state (correct)
  • Which of the following best describes isotopes?

    <p>Atoms of the same element with different numbers of neutrons</p> Signup and view all the answers

    In Tritium (3 1 H), how many protons, neutrons, and electrons are present, respectively?

    <p>1, 2, 3</p> Signup and view all the answers

    Which ion is formed when Uranium loses two electrons?

    <p>U2+</p> Signup and view all the answers

    What does the term 'ion' refer to?

    <p>An atom or a group of atoms that lose or gain electrons to form a charge</p> Signup and view all the answers

    What is the mass number of an atom?

    <p>The total number of protons and neutrons in the nucleus</p> Signup and view all the answers

    How is the atomic number represented in the symbol of an element in the periodic table?

    <p>As a subscript before the symbol</p> Signup and view all the answers

    What is the relationship between the mass number and the atomic number of an atom?

    <p>Mass number is greater than atomic number</p> Signup and view all the answers

    Which subatomic particle is not found in the nucleus of an atom?

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

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