Question

Elements A, B, C, D, E and F and their respective atomic numbers (within brackets) are given below:

A (3) , B (10) , C (11) , D (12) , E (14) , F (17).

Which of these is an element belonging to group 17 of the periodic table?

Answer 1

Out of the given elements, F belongs to group 17 of the periodic table.

• The atomic number of F is 17.
• So, its electronic configuration is 2,8,7.
• The number of outermost shell electrons of each element in a group is same. In group 17, all elements have 7 valence electrons.
• Therefore F belongs to group 17 of the periodic table.