Question

The atomic numbers of three elements are 5, 7 and 10
respectively. Which of these:


(a) Belongs to group 18


(b) Belongs to group 15


(c) Belongs to group 13

Answer 1

a. Group 18 is of noble gas. Thus the element having atomic number 10, that is Neon, belongs to group 18.

B. The element with atomic number 7 belongs to group 15. This element is Nitrogen

c. The element with atomic number 5 belongs to group 13. This element is Boron.

Answer 2

a)element with atomic number 10,belongs to group 18.
b)element with atomic number 7,belongs to group 15
c)element with atomic number 5,belongs to group 13