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