Answers

2015-01-21T18:31:55+05:30
When three elements are taken in the order of their increasing atomic masses the then the average mass of first and third element is equal to the second element

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2015-01-23T16:13:43+05:30
dorbereinier classification was named as doberinier triads .in this he form 9 tables of three elements in each as such a way that the avrage atomic maas of first and third is nearly equal to the second element in a triad.
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