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Li, Na, K are Dobereiner triads. If the atomic weight are 7 and 39 respectively then what would be the atomic weight of Na ? |
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Answer» Solution :Li (Lithium) = 7 atomic number K (Potassium) = 39 atomic number MIDDLE element of triads is NA ` :. ` Atomic weight of sodium = `((Li +K))/2= (7 + 39)/2 = 46/2 = 23` |
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