A, X, Y, B and Q are the elements belonging to 16th group of Modern periodic table. The correct trend of density in these elements is A < X < Y < B < Q. The element ‘A’ 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 ;