3 elements x , Y and Z form a Dobereine...

3 elements x , Y and Z form a Dobereiner triad . Their atomic weights are in the ratio 5 : 11 : 17 . If the sum of the atomic weights of extreme elements is 176 , then find the atomic weights of X , Y and z .

A

4080176

B

4088136

C

4080120

D

80100120

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