Question

প্রথম পিউনিক যুদ্ধের আলোচনা
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Answer 1

Explanation:

Dobereiner’s Triads: This classification is based on the atomic mass. According to this, when elements are arranged in order of increasing atomic masses, groups of three elements, having similar properties are obtained. The atomic mass of middle element of the triad being nearly equal to the average of the atomic masses of the other two elements

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