1.

Which of the following is Dobereiner 's triad ?

Answer»

`NE,Ca,NA`
`H_(2),N_(2),O_(2)`
`Li,Na,K`
`Na,Br,K`

Solution :In order of their atomic mass is the average of the FIRST and THIRD atomic mass of the elements is the triad of the second atomic mass of the elements.


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