Question

Write a typical Dobereiner’s triad?

Answer 1

Typical Dobereiner’s triad:

• It was founded by Johann Wolfgang Dobereiner in which elements are classified based on the similarity in their properties.
• Dobereiner’s law of Triad states that the arithmetic mean of the atomic mass of first and third element is equal to the middle element atomic mass in the triad.

Triad 1

Lithium: $6.94$

Sodium: $22.99$

Potassium: $39.1$

Triad 2

Calcium: $40.1$

Strontium: $87.6$

Barium: $137.3$

Triad 3

Chlorine: $35.4$

Bromine: $79.9$

Iodine: $126.9$

Triad 4

Sulfur: $32.1$

Selenium: $78.9$

Tellurium: $127.6$

Triad 5

Iron: $55.8$

Cobalt: $58.9$

Nickel: $58.7$