Question

Give five examples of dobereiner law of triads

Answer 1

The halogens, chlorine, bromine, and iodine, have atomic masses ≈ 35 g/mole, ≈ 80 g/mole, and ≈ 127 g/mole respectively. These values are rounded to the nearest g/mole. If we take the average of the masses of chlorine and iodine we get:

1/2(35 g/mole + 127 g/mole) = 81 g/mole, which is very close to bromine's atomic mass of 80 g/mole.

Answer 2

1) Lithium ,Sodium ,Potassium
2) Calcium,Strontium,Barium
3) Chlorine ,Bromine,Iodine
4) Sulphur,Selenium, Tellurium
5)Iron,Cobalt,Nickel