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

Answer:

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Explanation:

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