Question

Write the principle, main points, merit and demerits of dobereiner's triads and newland's law of octave.​

Answer 1

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Dobereiner’s triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. He observed that groups of three elements (triads) could be formed in which all the elements shared similar physical and chemical properties.

• This triad was made up of the alkali metals lithium, sodium, and potassium.
• As mentioned earlier, calcium, barium, and strontium formed another one of Dobereiner’s triads.
• The halogens chlorine, bromine, and iodine constituted one of the triads.
• The fourth triad was formed by the elements sulfur, selenium, and tellurium.
• Iron, cobalt, and nickel constituted the last of Dobereiner’s triads.

The key shortcomings of Dobereiner’s method of classifying elements are listed below.

• The identification of new elements made this model obsolete.
• Newly discovered elements did not fit into the triads.

• Only a total of 5 Dobereiner’s triads were identified.

• Even several known elements did not fit into any of the triads.

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