Atomic weight of ca = 40 and of ba =137 . according to Dobereiner traid rule, atomic weights of sr Will be

Question

Atomic weight of \( Ca =40 \) and of \( Ba =137 \). According to Dobereiner triad rule, atomic weight of \( Sr \) will be

Answer 1

According to Dobereiner triad rule Atomic weight of Sr will be

\(\text{Atomic wt. of Sr} = \frac{\text{Atomic wt. of Ca + Atomic wt. of Ba}}2\)

\(= \frac {40 + 137}{2}\)

\(= \frac {177}2\)

\(= 88.5\)