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प्रश्न
Can the following groups of elements be classified as Dobereiner's triad:
Na, Si, Cl
Atomic mass of Na - 23, Si - 28, Cl - 35.
Justify your answer.
उत्तर
According to Dobereiner's triad, the atomic mass of the second element is nearly equal to the average of the atomic masses of the first and the third elements provided the three elements are arranged in the increasing order of their atomic masses.
Na, Si, Cl:
Atomic mass of Na - 23, Si - 28, Cl - 35.
Average of atomic masses of Na and Cl =
Thus, it can be considered as Dobereiner's triad.
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संबंधित प्रश्न
What were the limitations of Dobereiner’s classification?
The arrangement of elements in a group of three is known as ________.
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.
Name the scientist who gave Law of triads in the early classification of elements.
State one example of a Dobereiner's triad, showing in it that the atomic mass of middle element is half-way between those of the other two.
What were the limitations of Dobereiner's classification of elements?
Can the following groups of elements be classified as Dobereiner's triads?
(a) Na, Si, Cl
(b) Be, Mg, Ca
Give reason for your answer.
(Atomic masses : Be 9 ; Na 23 ; Mg 24 ; Si 28 ; Cl 35.5 ; Ca 40)
In Dobereiner’s triads Li, Na, K, the atomic masses of Lithium and Potassium are 6.9 and 39.1 respectively, then what will be the atomic mass of sodium?
Did Dobereiners triads also exist in the columns of Newland's Octaves? Compare and find out.
According to Dobereiner’s triads rule, three elements in an increasing order of atomic mass shows _______.
