Chemistry Classification and Periodicity Quiz
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Chemistry Classification and Periodicity Quiz

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Questions and Answers

What is the equation, with state symbols, which represents the first ionization energy of arsenic?

  • $As(g) ightarrow As^+(g) + e^-$ (correct)
  • $As(g) + energy ightarrow As^+(g) + e^-$
  • $As^+(g) ightarrow As(g) + e^-$
  • $As(g) + e^- ightarrow As^-(g)$

    • What is the electronic configuration for an arsenic atom using the electrons-in-boxes notation?

  • 1s22s22p63s23p64s23d104s24p3
  • 1s22s22p63s23p63d104s23p4 (correct)
  • 1s22s22p63s23p63d104s24p3
  • 1s22s22p63s23p64s23d104p3

    • Why is the first ionization energy of selenium lower than that of arsenic?

  • Selenium has more electron shielding than arsenic (correct)
  • Selenium has a smaller atomic radius than arsenic
  • Selenium has a larger atomic radius than arsenic
  • Selenium has fewer electron shells than arsenic

    • Explain why the first ionization energy of krypton is higher than that of selenium.

    <p>Krypton has a smaller atomic radius than selenium</p> Signup and view all the answers

    Which of the elements, arsenic to rubidium, is likely to have atoms with the smallest atomic radius?

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

    Why is it necessary to study the chemical and physical properties of each element?

    <p>To understand the potential uses and dangers associated with each element</p> Signup and view all the answers

    What was the main reason for scientists to classify the elements?

    <p>To facilitate the study of the chemistry of a large number of elements and their compounds</p> Signup and view all the answers

    How many elements were known by 1865?

    <p>63</p> Signup and view all the answers

    What is the significance of the increasing number of identified elements over time?

    <p>It reflects the continuous discovery of new elements</p> Signup and view all the answers

    What is the relevance of studying the chemistry of all the elements and their compounds?

    <p>Understanding the diverse roles and impacts of each element in our lives</p> Signup and view all the answers

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