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Q.

How many  of the following properties of the elements chlorine, bromine and iodine increase with increasing atomic  number?
i) Ionization energy                                              ii) Ionic radius
iii) Bond energy of the molecule  X2                iv) Enthalpy of vaporization 

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answer is 2.

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Detailed Solution

ii, and iv are correct

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How many  of the following properties of the elements chlorine, bromine and iodine increase with increasing atomic  number?i) Ionization energy                                              ii) Ionic radiusiii) Bond energy of the molecule  X2                iv) Enthalpy of vaporization