EASY
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What are the limitations of Newlands' law of octave?

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Important Questions on The Periodic Table

EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
State Newlands law of Octaves. 
EASY
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Write the two limitations of Newland’s law of octaves.
EASY
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?
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
State the limitations of Newlands' Law of Octaves?
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? 
 
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

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.

MEDIUM
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.
HARD
Science>Chemistry>The Periodic Table>Early Attempts at 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.
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at 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.
HARD
Science>Chemistry>The Periodic Table>Early Attempts at 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?
HARD
Science>Chemistry>The Periodic Table>Early Attempts at 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.
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at 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.
HARD
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
(j) What is the achievement of Dobereiner’s law of triads?

(ii) What were the reasons for rejecting this classification?
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
HARD
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
(i) State two achievements of the law of octaves.
(ii) What were the reasons for rejecting the law of octaves?
HARD
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

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

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MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
The three imaginary elements X, Y and Z  represent a Dobereiner's triad. If the atomic mass of the element X is 14 and that of element Y is 46, then the atomic mass of element Z will be:
MEDIUM
Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements
Why is there a necessity for the classification of elements? Give at least two reasons.