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  • The first (Delta iH1) and the second (Delta iH2) ionization enthalpies (in kJ mol–1) and the ( Delta egH) electron gain enthalpy (in kJ molraised to minus 1) of a few elements are given below: the metal which can form a predominantly stable covalent halid

3.31 The first \Delta _ i H_1 and the second \Delta _ i H_2  ionization enthalpies (in KJ mol ^{-1} )  \Delta _{eg }H electron gain enthalpy (in KJ mol ^{-1}) of a few elements are given below:
Elements           \Delta H_1 \: \: \: \: \: \: \Delta H_2 \: \: \: \: \: \: \: \Delta _{eg }H
I                         520             7300         –60
II                        419             3051         –48
III                     1681             3374         –328
IV                     1008            1846         –295
V                      2372            5251           +48
VI                     738              1451            –40

(f)  the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

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The metal which can form a predominantly stable covalent halide of the formula MX is the element I which has low first ionization enthalpy, but a very high second ionization enthalpy. Therefore, it must be an alkali metal. Since the metal forms a predominantly stable covalent halide of the formula MX.

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Divya Prakash Singh

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