C, X, Z, B and D are the elements belonging to 16th group of Modern periodic table. The correct trend of atomic radius in these elements is C < X < Z < B < D. The element ‘B’ in the sequence is
Atomic radius… O<S<Se<Te<Po ;
Ionization enthalpy…O>S>Se>Te>Po ;
Melting point…O<S<Se<Po<Te ;
Boiling point….O<S<Se<Po<Te ;
Density……….O<S<Se<Te<Po ;
Electronegativity……O>S>Se>Te>Po ;
Electron gain enthalpy …. S>Se>Te>Po>O ;