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Chemistry LibreTexts

3.2.1.0: Trends in Size (Problems)

  • Page ID
    210694
  • PROBLEM \(\PageIndex{1}\)

    Based on their positions in the periodic table, predict which has the smallest atomic radius: Mg, Sr, Si, Cl, I.

    Answer

    Cl

    PROBLEM \(\PageIndex{2}\)

    Based on their positions in the periodic table, predict which has the largest atomic radius: Li, Rb, N, F, I.

    Answer

    Rb

    PROBLEM \(\PageIndex{3}\)

    Based on their positions in the periodic table, list the following atoms in order of increasing radius: Cs, Ca, Rb, Mg

    Answer

    Mg < Ca < Rb < Cs

    PROBLEM \(\PageIndex{4}\)

    Based on their positions in the periodic table, list the following atoms in order of increasing radius: Sr, Cl, Ca, Si.

    Answer

    Cl < Si < Ca < Sr

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    PROBLEM \(\PageIndex{5}\)

    Based on their positions in the periodic table, list the following ions in order of increasing radius: K+, Ca2+, Al3+, Si4+.

    Answer

    Si4+ < Al3+ < Ca2+ < K+

    PROBLEM \(\PageIndex{6}\)

    List the following ions in order of increasing radius: Br, Li+, Te2–, Mg2+.

    Answer

    Li+ < Mg2+ < Br< Te2–

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    PROBLEM \(\PageIndex{7}\)

    Which atom and/or ion is (are) isoelectronic with Br+: Se2+, Se, As, Kr, Ga3+, Cl?

    Answer

    Se, As

    PROBLEM \(\PageIndex{8}\)

    Which of the following atoms and ions is (are) isoelectronic with S2+: Si4+, Cl3+, Ar, As3+, Si, Al3+?

    Answer

    Si, Cl3+

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    PROBLEM \(\PageIndex{9}\)

    Compare both the numbers of protons and electrons present in each to rank the following ions in order of increasing radius: As3–, Br, K+, Mg2+.

    Answer

    Mg2+ < K+ < Br < As3–

    PROBLEM \(\PageIndex{10}\)

    The ionic radii of the ions S2–, Cl, and K+ are 184, 181, 138 pm respectively. Explain why these ions have different sizes even though they contain the same number of electrons.

    Answer

    They have different numbers of protons, which determines their size.

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