**Trends in the Periodic Table** 53. Arrange the elements Sr, In, and Te in order of (a) decreasing atomic radius. (b) decreasing first ionization energy. (c) increasing electronegativity. 54. Arrange the elements Na, Si, and S in order of (a) increasing atomic radius. (b) increasing first ionization energy. (c) decreasing electronegativity. 55. Which of the four atoms Rb, Sr, Sb, or Cs (a) has the smallest atomic radius? (b) has the lowest ionization energy? (c) is the least electronegative? 56. Which of the four atoms Na, P, Cl, or K (a) has the largest atomic radius? (b) has the highest ionization energy? (c) is the most electronegative? 57. Select the larger member of each pair. (a) K and K⁺ (b) O and O²⁻ (c) Tl and Tl³⁺ (d) Cu⁺ and Cu²⁺ 58. Select the smaller member of each pair. (a) N and N³⁻ (b) Ba and Ba²⁺ (c) Se and Se²⁻ (d) Co²⁺ and Co³⁺ 59. List the following species in order of decreasing radius. (a) C, Mg, Ca, Si (b) Sr, Cl, Br, I 60. List the following species in order of increasing radius. (a) Rb, K, Cs, Kr (b) Ar, Cs, Si, Al

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