Explain the law of triads with example.

Explanation

'The atomic weight of the middle element is the arithmetic mean of the atomic weight , of the other two elements in the group, such group , of the three elements were named as ''triads''.
Ex:- Consider Li - K triad.
`{:("Element",Li,Na,K),("Atomic Weight ",7,23,39):}`
`:.` Here middle element is Na. Its atomic weight is 23.
It is arithmetic mean of other two elements like Li and K.
i.e., `23=(7+39)/(2)=23`
`:.23=23`