جميع المواضيع المتعلقة بـ ‘دوبرينير’

 

Dobereinier’s law of tirade

Dobereinier’s law of tirade

In 1817 Dobereiner found that when elements are arranged in the order of increasing atomic masses, groups of three elements (known as triads) having similar chemical properties are obtained. The atomic mass of the middle element was found to be the average of the rest of the two :

 

Li                  Na                  K

7                   23                  39

Na = (7 +…

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