Question

A,B,C three element with atomic number z-1,z,z+1 respectively and B is a inertgas. a) Find Predict group a and C b)Which of the three have positive electron gain enthalpy and why. C) which one of the three have least ionization enthalpy and why

Answer 1

Answer:

The element having atomic number one greater than inert gases is alkali metal of the next period and one less than inert gases is halogen of the same period. Thus 'C' is an alkali metal and hence has the lowest ionizit belongs to group 18 . Therefore,Noble gases have high positive electron gain enthalpy because the electron has to enter next higher principal quantum level leading to a very unstable configuration . Hence , B has highest positive electron gain enthalpy .

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