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Give an example of the Dobereiner triad.

Important Questions on Periodic Classification of Elements

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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
A teacher asked to give an example for Dobereiner’s triad, Ramu wrote them as “Li, Na, Mg”, In these three, identify which element does not belong to this triad?
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Write the name of the scientist who has given a triad law for the classification of elements. Explain the law of triad.
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
The arrangement of elements in a group of three is known as _____.
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
What were the criteria used by Mendeleev in creating his Periodic Table?
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
What is Newlands’ Law of Octaves? What were the limitations of Newlands’ Law of Octaves? 
 
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Write the name of the scientist who has given the octave rule for the classification of elements. Explain the octave rule.
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Who proposed the law of Octaves? 
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads

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. 

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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Classification of elements helps us to
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Calcium, Strontium and Barium form a Dobereiner’s triad. The atomic masses of calcium and barium are 44 and 137 respectively. Predict the atomic mass of strontium.
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Why was the system of classification of elements into triads not found suitable?
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads

Rearrange the columns 2 and 3 to match with the column 1.

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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Which of the following are the limitations of Dobereiner Classification?
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.

F, Na, Mg, Al, Si, P, S, CI, Ar, K

(a) Pick two sets of elements that have similar properties.
(b) The given sequence represents what law of classification of elements?

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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
The law of triads is not applicable on:
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
What do you understand by triad of elements? Give an example.
HARD
Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Cl, Li, Ca, Br, Na,Sr, I, K and Ba. From the list of elements given above make three triads and name the family of each triad,
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Which of the following statement is not true for Newlands law of octaves?
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Science>Chemistry>Periodic Classification of Elements>Dobereiner’s Triads
Dobereiner showed that when the three elements in a triad were written in the _____ order of atomic masses; the atomic mass of the middle element was roughly the ________ of the atomic masses of the other two elements.