# In Dobereiner’S Triad Containing Li, Na, K, If Atomic Masses of Lithium and Potassium Are 6.9 and 39.1, Then What Will Be the Atomic Mass of Sodium? - Science and Technology 1

In Dobereiner’s triad containing Li, Na, K, if atomic masses of Lithium & Potassium are 6.9 and 39.1, then what will be the atomic mass of Sodium?

Atomic Mass of Sodium = (6.9+39.1)/2 = 23