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The values of first ionisation enthalpy of S and Cl are 1000 and 1256 kJ mol-1, respectively. Explain the observed trend. |
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Answer» The elements S and Cl belong to second period of the periodic table. Across a period effective nuclear charge increases and atomic size decreases with increase in atomic number. Therefore the energy required for the removal of electron from the valence shell (I.E.) increases in the order S < Cl. |
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