Which of thefollowingstatements are correct?

1.	Which of thefollowingstatements are correct?
Answer» Helium hashighest firstionisationenthalpyin the periodictable. Chlorinehas lessnegativeelectrongas enthalpy thanfluorine . Mercury andbromineare liquidsat room temperature . In anyperiodatomicradiusof alkali metal the highest . Solution :Statement(a) iscorrectsinceheliumbeing thesmallernoblegas hasthehighest ionization enthalpy a Dut toelectron- electronrepulsions in thesmallF atom. Theelectrongainenthalpyof F islowerthan THATOF C1 , i.e.,option( b) iswrong . Statement( c) iscorrect . Statement( d) isbecausein any periodnoblegas has thelargestatomicradius . Please notethat inthe NCERT exemplar the answerto thisstatementis given tobe correctwhichis WRONG .

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