question_answer 1)

  Which of the following sequences contain atomic numbers of only representative elements? (a) 3, 33, 53, 87                  (b) 2, 10, 22, 36                  (c) 7, 17, 25, 37, 48           (d) 9, 35, 51, 88

Answer:

  (a, d) Atomic number                Group 3                                              13 (III A) 33                                           15 (V A) 53                                           17 (VII A) 87                                           1 (I A) 9                                              17 (VII A) 35                                           17 (VII A) 51                                           15 (V A) 88                                           2 (II A) The elements belonging to s-and p-blocks (except group 18) are called representative elements.