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Explain (a) Dobereiner triads (b) Newlands law of octaves.

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(a) Dobereiner triads: He make a group of three elements in such a way that the average of atomic masses of 1st and 3rd elements is equal to the atomic mass of the middle one such as Li, Na and K.
(b) Newlands law of Octaves: When elements were arranged in such a way that the physical and chemical properties of each eighth element were resembling.

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