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The law of triads is not applicable on:

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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

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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

(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?

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at 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.

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

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.

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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

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:

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Give an example of a triad suggested by Dobereiner.

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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