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Identify Dobereiner's triads from the fo...

Identify Dobereiner's triads from the following groups of elements having similar chemical properties?
Mg (24.3), Ca (40.1), Sr (87.6)

Text Solution

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Mg (24.3), (b) Ca (40.1), (c) Sr (87.6)
`:.` Mean of `(a+c)/2= 111.90/2=55.95`
which is not approximately equal to the atomic mass of middle element (Ca). Therefore, it does not form Dobereiner.s triads.
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