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Why did Dobereiner's law fail?

Important Questions on Periodic classification of elements

EASY
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Who proposed the law of Octaves? 
EASY
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Write the two limitations of Newland’s law of octaves.
EASY
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
Write the name of the scientist who has given a triad law for the classification of elements. Explain the law of triad.
HARD
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? 
 
EASY
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
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
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
Classification of elements helps us to
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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

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.

EASY
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
State 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
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.
HARD
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Can the following groups of elements be classified as Dobereiner’s triad?

(a) Na, Si, CI
(b) Be, Mg, Ca
Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40

Explain by giving a reason.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
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>Early Attempts at the Classification of Elements
The three elements A. B and C with similar properties have atomic masses X. Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called?
Give one example of such a set of elements.
HARD
Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
(i) State the law of octaves,
(ii) Name the scientist who framed the above law.
(iii) Two elements A and B obey the law of octaves. How many elements are in between A and B?
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
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Science>Chemistry>Periodic classification of elements>Early Attempts at the Classification of Elements
Chlorine, Bromine and Iodine form a Dobereiners triad. The atomic masses of chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of bromine.