1.

Considers dobereinter traid with elementsX , Y and Z The sum of atomic weights of extreme elements X and Z is 46and the different of atomic weights Z and Y is two times the atomic number of oxygen .Identify X Y and Z.

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Solution :Given X+Z=`46rarr(1)`
`Z-Y=16 RARR(2)`
`As (X+Y)/(2)=Y` (Dobereiner's law of TRIADS)
`therefore Y=(46)/(22)=23rarr(3)`
From EQUATION (2) and (3) Z-23 =16 `rarr` Z=39
From equation (1)X+Z=46 `rarr`X+39=49`rarr`X=7
So X,Y and Z are Li Na and K respectively


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