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

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Important Questions on The Periodic Table

EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
What were the criteria used by Mendeleev in creating his Periodic Table?
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Write the two limitations of Newland’s law of octaves.
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Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
The arrangement of elements in a group of three is known as _____.
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Identify the correct order of atomic radii of the following elements:
HARD
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
What is Newlands’ Law of Octaves? What were the limitations of Newlands’ Law of Octaves? 
 
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Who proposed the law of Octaves? 
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Science>Chemistry>The Periodic Table>Early Attempts at 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?
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Write Newlands Law of 'Octaves' for classification of elements.
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Classification of elements helps us to
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
State the limitations of Newlands' Law of Octaves?
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Write the name of the scientist who has given the octave rule for the classification of elements. Explain the octave rule.
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
State Newlands law of Octaves. 
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Science>Chemistry>The Periodic Table>Early Attempts at 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.
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at 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>The Periodic Table>Early Attempts at 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. 

MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at 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.
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
The law of triads is not applicable on
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Which of the following is not a Dobereiner's triad?
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Name the scientist who gave the Law of octaves?
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Which of the following is a Dobereiner's triad?