Mendeleev's Periodic Law states that physical and chemical properties of elements are a periodic function of their atomic masses. (a) Mendeleev classified elements according to Mendeleev's Periodic Law. (b) Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. (a) What was Mendeleev's basis for classification of elements? Similar properties of calcium, strontium and barium were: The elements calcium, strontium and barium were put in one group or family on the basis of their similar properties. These metals impart colour to the flame.They have one electron in the outermost shell, so they form unipositive ions.Similar properties of lithium, sodium and potassium were: Lithium, sodium and potassium elements were put in one group on the basis of their similar properties. ![]() From this, we conclude that Dobereiner's triads also exist in the columns of Newland's Octaves. We also know that lithium, sodium, and potassium form a Dobereiner's triad having similar chemical properties. This means that according to Newland's law of octaves, the elements lithium, sodium, and potassium should have similar chemical properties. If we start with lithium as the 1st element, then the 8th element from it is sodium, and according to Newlands' law of octaves, the properties of the 8th element, sodium should be similar to those of the 1st element, lithium.Īgain, if we take sodium as the 1st element, then the 8th element from it is potassium, and according to Newland's law of octaves, the properties of the 8th element, potassium should be similar to those of the 1st element, sodium. Yes, Dobereiner's triads also exist in the columns of Newland's octaves.Įxample: Consider the elements lithium (Li), sodium (Na), and potassium (K) present in second column of Newland's classification of elements.
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