Science, asked by Anonymous, 4 months ago

please give known answer...class 10

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Answered by sakash20207

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Such an arrangement of elements is called triad, as in Dobereiner’s Triads. Example: Lithium (Li) 7.0, Sodium (Na) 23.0, Potassium (K) 39.0 make a triad in which atomic mass of sodium is equal to average of atomic masses of lithium and potassium.

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