Question

10. The atomic number of three elements are given below.
Element (Symbol)=A B C
Atomic number=5 7 10
Write the symbol of the element which belongs to group 13 and group 15 of the
periodic table. State the period of the periodic table to which these elements
belong. Give reason for your answer​

Answer 1

Answer:

Explanation

• Boron has atomic  number 5A group and it belongs to group 13.

• Nitrogen has atomic number 7B group and it belongs to group 15.

• Neon has atomic number 10C group and it belongs to group 18.

All of these belongs to second period

Answer 2

Answer:

i A

ii B

iii 2

Explanation:

because it belongs to 2nd period