Which of the following statements are correct? (a) Helium has the highest first ionization enthalpy in the periodic table. (b) Chlorine has less negative electron gain enthalpy than fluorine. (c) Mercury and bromine are liquids at room temperature. (d) In any period, atomic radius of alkali metal is the highest.

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A,C and D are correct
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(a, c, d) Chlorine has more negative electron gain enthalpy than fluorine due to bigger size and lesser electronic repulsion.
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