11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 95)   Electronic configuration of some elements is given in column I and their electron gain enthalpies are given in column II. Match the electronic configuration with electron gain enthalpy.
    Column l Electronic configuration Column ll Electron gain enthalpy/ \[\mathbf{kJ}\,\mathbf{mo}{{\mathbf{l}}^{\mathbf{-1}}}\]
    (1) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\] (a) ? 53
    (2) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{1}}\] (b) ? 328
    (3) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}2{{p}^{5}}\] (c) ? 141
    (4) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{4}}\] (d) + 48
                   

    Answer:

      (i - d) Intert gases \[(2{{n}^{2}}n{{p}^{6}})\] have positive electron gain enthalpy because addition of electron is not easily possible. (ii - a) Alkali metals have very low electron gain enthalpy. (iii - b) Halogens (chlorine) have very large negative electron gain enthalpy. (iv - c) Oxygen has electron gain enthalpy, next to (chlorine) halogens because oxygen is also an electron deficient element.

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