The following statements concern elements in the periodic table. Which of the following is true ?
A. (1) The Group 13 elements are all metals.
B. (2) All the elements in Group 17 are gases,
C. (3) Elements of Group 16 have lower ionization enthalpy values compared to those of Group 15 in the corresponding periods.
D. (4) For Group 15 elements, the stabity of +5 oxidation state increases down the group.
