[" The elements "A,B,C,D" and "E" have atomic number "9,11,17,12" and "],[13" respectively.Which pair of elements belongs to the same group? "]

The elements A,B,C,D and E have atomic number 9,11,17,12 and 13 respectively. Which pair of elements belong to the same group?

Five elements A,B,C,D and E have atomic numbers of 2,3,7,10 and 18 respectively. The elements which belong to the same period of the periodic table are:

Elements A,B, C and D have atomic number 9,17,19,35 respectively. Choose the odd element-

Which of the following elements A , B , C , D and E with atomic numbers 3 , 11 , 15 , 18 , and 19 respectively belong to the same group ?