Quantum Models of Atoms: Quantum Numbers and Atomic Orbitals
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Questions and Answers

How is the Modern Periodic Table different from Mendeleev's Periodic Table?

  • It is based on atomic number instead of atomic mass. (correct)
  • It arranges elements based on the number of electron orbits.
  • It uses roman numerals and alphabets to classify elements.
  • It groups elements based on their reactivity with water.

    • What is the significance of atomic number in the Periodic Table?

  • It represents the number of electron shells in an atom.
  • It indicates the number of protons in the nucleus of an atom. (correct)
  • It reflects the reactivity of elements with oxygen.
  • It determines the valency of elements in a group.

    • Which group in the Periodic Table consists of elements with limited reactivity?

  • Group 8A - Noble Gases (correct)
  • Group 1A - Alkali Metals
  • Group 7A - Halogens
  • Group 2A - Alkaline Earth Metals

    • What do the Group 1A elements in the Periodic Table react with oxygen to form?

    <p>Metallic oxides that are basic</p> Signup and view all the answers

    Which group of elements in the Periodic Table is known for compounds that are insoluble in water?

    <p>Group 2A - Alkaline Earth Metals</p> Signup and view all the answers

    What does the term 'halogen' in Group 7A of the Periodic Table refer to?

    <p>'Salt-producing'</p> Signup and view all the answers

    How are the representative or main group elements classified in the Periodic Table?

    <p>In the longer columns labeled A Group</p> Signup and view all the answers

    'Inner Transition Elements' in the Periodic Table are located where?

    <p><em>In the two long rows at the lower section of the table</em></p> Signup and view all the answers

    Which scientist is credited with the discovery of the concept of atomic number?

    <p>Not mentioned in the text</p> Signup and view all the answers

    What was the basis of Mendeleev's Periodic Table?

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

    In Mendeleev's Periodic Table, how were elements arranged as they moved across the table?

    <p>Increasing atomic mass</p> Signup and view all the answers

    What does the Modern Periodic Table use as the basis for element arrangement?

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

    What term describes the number of electron shells (orbits) in an atom of an element?

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

    Which group of elements in the Periodic Table are known for compounds that are basic when dissolved in water?

    <p>Alkali Metals (Group 1A)</p> Signup and view all the answers

    Which group of elements in the Periodic Table is referred to by the Greek word 'hal-' meaning 'salt' and '-gen' meaning 'to produce'?

    <p>Halogens (Group 7A)</p> Signup and view all the answers

    'Representative or Main Group Elements' in the Periodic Table are classified under which longer columns?

    <p>(The A Group) Main Group Elements</p> Signup and view all the answers

    'Inner Transition Elements' in the Periodic Table are located where?

    <p>(Inner Transition Elements)</p> Signup and view all the answers

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