Question

Two triads that exist in the columnsbof Newland's octaves. ​

Answer 1

Answer :

Döbereiner's triads also existed in Newland's octaves like :

• $\sf \underbrace{Li, \: Na, \: K}$
• $\sf \underbrace{Be, \: Mg, \: Ca}$

Answer 2

Answer:

Only one triad of Dobereiner's triads exists in the columns of Newlands' octaves. The triad formed by the elements Li, Na, and K of Dobereiner's triads also occurred in the columns of Newlands' octaves.