Answer
(a) Te is a main group element, belonging to Group-6A
(b) K is a main group element, belonging to Group-1
(c) V is not a main group element, belonging to Group-5B
(d) Re is not a main group element, belonging to Group-7B
(e) Ag is not a main group element, belonging to Group-1B
Work Step by Step
(a) Te is a main group element, belonging to Group-6A
(b) K is a main group element, belonging to Group-1
(c) V is not a main group element, belonging to Group-5B
(d) Re is not a main group element, belonging to Group-7B
(e) Ag is not a main group element, belonging to Group-1B