Glossary

    • (a) What is the trend in atomic size from left to right for period 3? Explain.
    • (b) What is the trend in atomic size in group VIIA? Explain.
    • (c) Which element has the smallest atomic radius?
      Mg Sr Be
    • (d) Which element has the largest atomic radius?
      Ca Kr As
    • (e) Which element has the smallest atomic radius?
      S Ba Te
    • (f) Which element has the largest atomic radius?
      Sn P Cs
    • (g) What group of elements on the periodic table has the greatest atomic size?

      The halogens The noble gases The alkali metals

    • (h) Which is the larger, a potassium atom or a potassium ion? Explain.
    • (i) Which is the larger, a fluorine atom or a fluoride ion? Explain.
    • (j) How does the atomic radius of copper, a transition element, compare the ionic radius of copper, Cu+?

      The ionic radius is much larger.
      They are about the same.
      The atomic radius is larger.

    • (k) What is an isoelectronic series?
    • (l) Which of the following sets are isoelectronic with each other?

      K+, Ca+2, Ar
      Al, Mg2+, Si
      Ar, Ne, Kr

    • (m) Which of the following sets are isoelectronic with each other?

      Rb+, Sr+2, Xe
      Al+3, Na+, Ne
      Br-, Na+, Se-2

    • (n) Arrange the atoms and ions in order of increasing size, Rb+, Na+, and K+.

      Na+ < K+ < Rb+
      Rb+ < K+ < Na+
      Na+ < Rb+ < K+

    • (o) Arrange the atoms and ions in order of increasing size, Li+, Be+2, and Cl-.

      Cl- < Li+ < Be+2
      Be+2 < Cl- < Li+
      Be+2 < Li+ < Cl-

    • (p) Arrange the atoms and ions in order of increasing size, K+, S-2, Cl- and Ar.

      K+ < S-2 < Cl- < Ar
      K+ < Ar < Cl- < S-2
      S-2 < Cl- < Ar < K+

    • (q) What is the trend in melting points for the alkali metals?
    • (r) What is the trend in boiling points for the halogens?
    • (s) Arrange the following in increasing boiling points, Rb, K, Li, Cs ?

      K < Li < Rb < Cs
      Li < K < Rb < Cs
      Cs < Rb < K < Li

    • (t) Arrange the following in increasing melting points, I, Cl, Br, F ?

      F < Cl < Br < I
      I < Br < Cl < F
      F < Br < Cl < I

    • (u) Arrange the following in increasing boiling points, Na, Br, F ?

      F < Br < Na
      Na < Br < F
      Br < F < Na

    • (v) Arrange the following in increasing metallic characteristics, Na, Al, Rb ?

      Al < Cs < Na
      Cs < Na < Al
      Al < Na < Cs

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Chemistry Department
British Columbia Institute of Technology, Burnaby, B.C. Canada.
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