Question

dobereiners triads mg(24.3) ca(40.1) sr(87.6)
Be(9.0) mg(24.3) ca(40.1)
atomic mass of middle term=mean of remaining other two elements.
case-1
therefore, mg+sr=24.3+87.6
=111.9
=111.9÷2
=55.95
such that,55.95 is not nearly eqaul to 40.1,so this is not a dobereiners triad.
case-2
as per dobereiners triads
Be+ca=9.0+40.1
=49.1
=49.1÷2
=24.55
such that,24.55 is nearly close to 24.3 that is the mass of mg
hence,option 2 is right.
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Answer 1

Answer:

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