• (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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