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Electronic configuration of some elements is given in colum I and their electron gain enethalpies are given in Column II mathc the electronic configuration with electron gain enthalpy
ColumnI(Electronic configuration)ColumnIIElectron gain enthalpy / KJ mol1A.1s22s22p653B.1s2,2s2,2p6,3s1328C.1s2,2s2,2p5141D.1s2,2s2,2p4+48


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    Solution

    A. this electronic configuration corresponds to the noble gas i.e. neon Since, Noble gases have +egH values, therefore, electronic configuration (A) corresponds to the eg H = + 48 KJ mol1
    B. This electronic configuration corresponds to the alkali metal i.e. potassium. Alkall metals have small negative egH value hence, electronic configuration (B) corresponds to egH = 53 KJ mol1
    C. This elecgronic configurations corresponds to the hetogen i.e., flucring since, halogens haven high negative egH values therefore electronic configuration (C) corresponds to \egH = 328 KJ mol1
    D. This electronic configuration corresponds to the chalcogen i.e.e, oxygen. Since chalcogens have \triangle_{eg} H values negative than those fo haogens, thererfore electronic configuration (D) correspond to egH= 141 KJ mol1


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