Question

'A', 'B' and 'C' are three elements that form a triad. If the atomic weight of 'A' is 7 and that of
'C' is 39 then according to Döbereiner's rule of triads what will be the atomic weight of 'B'?

Answer 1

According to dobereiner's triad,

A + C ÷ 2 = B

Here,

A = 7
C= 39
B= ?

Therefore,

7 + 39 ÷ 2 = C
46÷2 = C
23 =C

The element C has the atomic weight of 23u which is same as Sodium

C = Sodium

Answer 2

Answer:

23

Explanation: