Question

Analyse the elements given below and identify X if the given elements are forming Dobereiner's triad.
Li (6.9), Na (X), K (39.0)
1..X is 15.3
2..W X is 23.0
3..W X is 19.0
4..W X is 45.9

please answer​

Answer 1

the answer is

2

atomic mass of sodium is 23

Answer 2

$\huge \fbox \red{Answer}$

Li, Na and K form a triad.

Given the atomic weight of Na is 'X'

Therefore, the answer is option 2 since Na's atomic weight is 23.