Question

Section
Fill in the blanks:
7. Atomic number of sodium is
8. Valency of oxygen is
9. Molecular mass of H2O is
10.Aotion and reaction are equal and
11. The friction force arises between two surfaces are in

please help me it's argent to do​

Answer 1

Answer:

atomic no. of sodium is 11

valency of oxygen is 2

Answer 2

Answer:

7.11

8.2

9.(1.01)2+16.00

=18.02

10.opposite

11.heating