Question

State dobereiner Law of trade with suitable example

Answer 1

According to Dobereiner, all elements occurred in groups of three, when arranged in increasing order of atomic masses. He referred to these groups as triads. In a traid the elements had similar chemical properties.

Traids of the Dobereiners classification:

Traid1:

Element

Atomic mass

Lithium (Li)

7

Sodium (Na)

23

Potassium (K)

39

Traid2:

Element

Atomic mass

Chlorine (Cl)

35.5

Bromine (Br)

80

Iodine (I)

127

Traid3:

Element

Atomic mass

Calcium (Ca)

40

Strontium (Sr)

88

Barium (Ba)

137

Dobereiner’s law of triads states that, the atomic mass of the middle element of a triad is the arithmetic mean of the atomic masses of the other two elements.

Example:

In the triad of lithium, sodium and potassium. The atomic mass of lithium is 7 and the atomic mass of potassium is 39. The average of masses of lithium and potassium gives atomic mass of sodium 23.

Drawbacks:

All the known elements could not be arranged in the form of triads.

This law did not hold good for elements with very low or very high atomic mass.

Example: The arithmetic mean of the atomic masses of fluorine 19 and bromine 80, which comes to 49.5, varies significantly from the atomic mass of chlorine, which is 35.5.

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Answer 2

Explanation:

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