Early Attempts at the Classification of Elements

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Early Attempts at the Classification of Elements: Overview

This topic covers concepts such as Early Attempts at Classification of Elements, Dobereiner's Triads, Newlands' Law of Octaves, Limitations of Newlands' Law of Octaves, Basis of Dobereiner's Triad, Limitations of Dobereiner's Triads, etc.

Important Questions on Early Attempts at the Classification of Elements

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 1

Dobereiner could identify only three triads from the elements known at that time. One of them is:

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 2

Dobereiner could identify only three triads from the elements known at that time.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 3

The Dobereiner's groups of elements are called_____.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 4

Give an example of the Dobereiner triad.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 5

What are the limitations of Dobereiner's Triads?

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 6

State Dobereiner's law of triads.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 7

 State "Newlands' Law of Octaves" for the classification of elements.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 8

Name the chemist who gave triad rule for classification of elements.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 9

In Dobereiner's triads, the atomic weight of the middle element is the _____ of the atomic masses of 1st and 3rd elements.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 10

The 'Law of Octaves' was given by the scientist Lother Meyer

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 11

The arrangements of elements in a group of three is known as _____.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 12

According to octaves rule when elements are arranged in the order of increasing atomic masses, the properties of the eight element (starting from a given element) are a repetition of the properties of the first element.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 13

Example of Dobereiner's triad is:

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 14

Among the following elements, _____ does not fit in Dobereiner's traid.

F, Cl, Br, I

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 15

One of the limitations of the Law of Octaves is that it was only applicable up to the atom _____.

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 16

Before the Modern Periodic Table was proposed and accepted there were numerous theories propounded and rejected. Most notable among them were those proposed by Mendeleev, Newland and Dobereiner.
Why did these theories fail?

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 17

Why did Dobereiner's law fail?

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 18

Is Dobereiner's law of triads restricted to elements exhibiting similar properties?

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 19

How many elements were known at the time of Newlands?

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Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements> Q 20

Which property of the middle element in a Dobereiner's triad was said to be the average of that of the first and the third element? (Atomic mass / Atomic number)