Question

1 5:16 a
In Dobereiner's triad, 23 is
the mean of atomic masses
of Li and K. This is the
atomic mass of​

Answer 1

Answer:

Na is the element having atomic mass of 23 .

Answer 2

Doberiner Law of Triad:

Definition: The set of three elements are kept in ascending order (increasing) of their atomic weights, then the set is called a triad. In each triad the atomic mass and properties of the middle element is the arithmetic mean of first and third element.

Let, Unknown Element be 'x'

Then, the set is Li, x, K

Atomic Weight of Li = 7

Atomic Weight of K = 39

$→\; \frac{7 + 39}{2}$

$= 23$

.:. The Atomic Weight of x is 23

So, The Unknown Element is

◕➜ $\Large\red{\bold{Sodium\;Na}}$

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