Question

atomic mass of middle element in dobereiners traid is-
a) arithmetic mean of atomic numbers of other two
b) Atomic mean of atomic masses of other two
c) median of atomic numbers of other two
d)none of these​

Answer 1

AnSWeR-

option B is correct answer.

In dobereiners triad elements are arrange in that way the atomic mass of middle element is average mean of another two elements.

for example :

Li- 6.9

Na- 23

K- 39.1

in this case the middle element of atomic mass is average mean of other two element (6.9+39.1)÷2 =23

Answer 2

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c option

______

hopefully it helps