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What are the limitations of Dobereiner's Triads?

Important Questions on Periodic classification of elements

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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Classification of elements helps us to
EASY
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
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>Early Attempts at the Classification of Elements
State the limitations of Newlands' Law of Octaves?
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
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>Early Attempts at the Classification of Elements

Chlorine, Bromine, and Iodine form a Dobereiner's Triad. If the approximate atomic mass of Chlorine is 35 and that of Iodine is 127:

Find the atomic mass of Bromine.

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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
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>Early Attempts at the Classification of Elements
Write Newlands Law of 'Octaves' for classification of elements.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
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>Early Attempts at the Classification of Elements
Who proposed the law of Octaves? 
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
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>Early Attempts at the Classification of Elements

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>Early Attempts at the Classification of Elements
What were the criteria used by Mendeleev in creating his Periodic Table?
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
The arrangement of elements in a group of three is known as _____.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
What is Dobereiner's triads? Explain with examples.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Lithium, sodium and potassium from a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.
EASY
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Show that chlorine, bromine and iodine (atomic masses 35.5, 80 and 127) respectively constitute a triad.
HARD
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
How would you say S, Se and Te are triads?
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Write the triads formed by Dobereiner.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
What do you understand by triad of elements? Give an example.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Explain the limitation of Dobereiner's triads with an example.