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प्रश्न
If Dobereiner is related with ‘law of triads’, then Newlands is related with ______.
विकल्प
Modern periodic law
Hund’s rule
Law of octaves
Pauli’s Exclusion principle
उत्तर
If Dobereiner is related with ‘law of triads’, then Newlands is related with Law of octaves.
APPEARS IN
संबंधित प्रश्न
The arrangement of elements in a group of three is known as ________.
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.
The three imaginary elements X, Y and Z represent a Dobernener's triad. If the atomic mass of element X is 14 and that of element Y is 46, then the atomic mass of element Z will be:
(a) 28
(b) 60
(c) 78
(d) 72
The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively.
(a) Calculate the average atomic mass of elements X and Z.
(b) How does the average atomic mass of elements X and Z compare with the atomic mass of element Y?
(c) Which law of classification of elements is illustrated by this example?
(d) What could the elements X, Y and Z be?
(e) Give another example of a set of elements which can be classified according to this law.
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)
Did Dobereiners triads also exist in the columns of Newland's Octaves? Compare and find out.
Write the characteristic of Dobereiner’s triads?
According to Dobereiner’s triads rule, three elements in an increasing order of atomic mass shows _______.
Match the following.
| 1. | Triads | Newlands |
| 2. | Alkali metal | Calcium |
| 3. | Law of octaves | Henry Moseley |
| 4. | Alkaline earth metal | Sodium |
| 5. | Modern Periodic Law | Dobereiner |
