Whan a Dobereiner triad is considered, the sum of atomic weights of extreme elements X and Z is 177.6 and difference of Z and Y is five times the number of protons present in a neon atom. Identify X, Y and Z.

Whan a Dobereiner triad is considered, the sum of atomic weights of e

1.	Whan a Dobereiner triad is considered, the sum of atomic weights of extreme elements X and Z is 177.6 and difference of Z and Y is five times the number of protons present in a neon atom. Identify X, Y and Z.
Answer» SOLUTION :`X + y = 177xx6` `z - y = 5 xx10` `{:(177.6),(50.0),("____"),(127.6),("____"),():}` `((-)(+)-)/(x + y= 127.6)` As X, Y and Z from Dobereiner TRIED `y = (x+ z)/(2)`, where x, y and z are atomic MASSES of X, Y and Z, RESPECTIVELY `y = (177.6)/(2) = 88.8` `x = 127.6 - 88.8 = 38.8` `z = 177.6 - 38.8 = 138.8` `x = 38xx38 = 40` `X = 40 rArrCa` `Y = 88xx80 rArrSr` `Z = 138xx6 rArrBa `.