Question

atomic number of three element are 5,7 and 10 respectively. Which of these:
1), belongs to group 18
2) belongs to group 15
3) belongs to group 13

Answer 1

atomic number 10 belongs to group 18 atomic number 7 belongs to group 15 and atomic number 5 belongs to group 13 of modern peroidic table

Answer 2

The atomic number 5 is of Boron and belongs in group 13.
The atomic number 7 is of Nitrogen and belongs in group 15.
The atomic number 10 is of Neon and belongs in group 18