Mendeleev's Periodic Table and Law

Q.

(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

Q.

What are the defects of Mendeleevs periodic table?

Q. Mendeleev predicted the existence of some undiscovered elements based on his periodic table.

1. True
2. False

Q.

How many elements were known at the time of Mendeleev?

1. 118

2. 40

3. 112

4. 63

Q.

Why Mendeleev's choice of formulae of compounds as the basic for deciding the position of an element in his table was a good one? How would this lead to elements with similar chemical properties being placed in the same group?

Q.

An element X forms an oxide $X_2{O}_3$ In which group of Mendeleev’s periodic table is this element placed?

(a) group II (b) group III (c) group V (d) group VIII

Q.

(a) State the periodic law on which Mendeleev’s periodic table was based. Why and how was this periodic law changed?

(b) Explain why the noble gases are placed in a separate group.

Q.

Why did Mendeleev leave gaps in his Periodic Table?

Q.

What was the basis for Mendeleevs periodic law?

Q.

How many elements were known when Mendeleev started his work on his periodic table?

1. 45

2. 55

3. 69

4. 63

Q. Newlands' law of octaves was valid only up to calcium.

1. True
2. False

Q.

The horizontal rows in Mendeleevs Periodic table are numbered from ____.

Q. Choose the pairs of elements with similar properties according to Newlands' law of octaves.

1. Al
2. Mg
3. B
4. Na
5. Be
6. Li

Q. Mendeleev placed hydrogen in the 1st group along with alkali metals.

1. False
2. True

Q.

(a)What is the basis of the classification of elements in Mendeleevs periodic table?

(b)State Mendeleevs periodic law

Q.

(a) State Mendeleev’s periodic law.

(b) What were the chemical properties of elements used by Mendeleev in creating his periodic table?

(c) State any three limitations of Mendeleev’s classification of elements.

(d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?

(e) Which group of elements was missing from Mendeleev’s original periodic table?

Q. Mendeleev placed hydrogen in the 1st group along with alkali metals.

1. True
2. False

Q. Dobereiner arranged the elements in increasing order of their

1. atomic masses
2. atomic volumes
3. atomic numbers
4. atomic densities

Q.

Give the name and symbol of the following elements which occupy each of the following positions in the Mendeleev periodic table.

1. Period 4 Group 2a

Q. Write short notes.​ [3 marks]

a. Mendeleev’s periodic law. ​
b. Structure of the modern periodic table.​
c. Position of isotopes in the Mendeleev’s and the modern periodic table.​

Q. Without knowing the electronic configurations of the atoms of elements, Mendeleev still could arrange the elements nearly close to the arrangements in the Modern Periodic Table. How can you appreciate this?

Q. Statement 1: Mendeleev's periodic law states that the properties of elements are the periodic function of their atomic mass.

Statement 2: The modern periodic law states that the properties of elements are the periodic function of their atomic number.

1. Statement 1 is true but statement 2 is false.
2. Both statement 1 and statement 2 are true.
3. Both statement 1 and statement 2 are false.
4. Statement 1 is false and statement 2 is true.

Q.

1. J. L. Meyer
2. John A. R. Newlands
3. Dobernier
4. D.l. Mendeleev

Q. Match the following elements from Mendeleev's periodic table to their names in the modern periodic table.

1. Gallium
2. Scandium
3. Germanium

Q. Newlands' law of octaves was valid only up to calcium.

1. False
2. True

Q. Mendeleev arrange the elements in the increasing order of their atomic weight in his periodic table.
If true enter 1, else enter 0.

Q. Newlands' law of octaves was valid only up to calcium.

1. True
2. False

Q. Newlands' law of octaves was valid only up to calcium.

1. True
2. False

Q. Match the following elements from Mendeleev's periodic table to their names in the modern periodic table.

1. Gallium
2. Scandium
3. Germanium

Q. Which chemical compounds of elements were used by Mendeleev to gauge their chemical similarities?

1. Oxides
2. Chlorides
3. Hydrides
4. Sulphites