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expeople1 [14]
3 years ago
7

Plz help it’s urgent!!! :) ❤️❤️❤️

Mathematics
1 answer:
Y_Kistochka [10]3 years ago
7 0

Answer:

Dobereiner's Triads are groups of three elements arranged in such a way that the atomic weight of the middle element is almost the average of the other two. The elements of triad have almost similar properties

no

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If you expand out the brackets you get this,

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