Mendeleev's Periodic Law

Q.

State two limitations of Mendeleev Periodic Table.

Q. What are the limitations of Mendeleev's periodic table? How could the modern periodic table overcome the limitations of Mendeleev table?

Q.

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (Any two)

Q.

Anomalous pair in Mendeleevs periodic table is:

1. $\mathrm{Li},\mathrm{Na}$

2. $\mathrm{Co},\mathrm{Ni}$

3. $\mathrm{Mg},\mathrm{Al}$

4. $\mathrm{Be},\mathrm{B}$

Q.

State two merits of Mendeleevs periodic table over previous attempts of the classification of the elements.

Q.

State the modified (modern) Mendeleevs Periodic Law.

Q. Write a short note on : Position of isotopes in the Mendeleev's and the modern periodic table.

Q. Modern periodic law stated that__________.

1. Properties of elements are a periodic functions of their atomic number
2. Properties of elements are a periodic functions of their atomic mass
3. None of above
4. Properties of elements are a periodic functions of their number as well as atomic mass

Q. Assertion :The modern periodic table remove various anomalies of Mendeleev's periodic table. Reason: Modern periodic table was based on the atomic number rather than atomic weight of the elements. The missing elements were given position with their properties in modern table.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q.

What main drawbacks of Mendeleevs periodic table have been removed by classification of elements on the basis of atomic number?

Q.

Fill in the blanks with regards to the defect of the Mendeleev periodic table.

-------- as not assigned a definite position.

Q.

What are the merits of Mendeleev’s periodic table?

Q.

What were the two criteria used by Mendeleev in his periodic table?

Q.

Mendeleev's Periodic law is based on

1. Atomic Number

2. No of e^-

3. Mass Number

4. Atomic mass

Q.

With respect to the merits of the Mendeleev periodic table answer the following question.

Which atomic weights were collected with the help of this periodic table?

Q.

In modern terminology, Eka - Silicon is called ______

1. Phosphorous

2. Germanium

3. Carbon

4. Aluminium

Q. What is/are the main contributions of Mendeleev’s Periodic Table?

1. Systematic study of elements
2. Prediction of new elements
3. Correction of doubtful atomic weight
4. All of these

Q. In modern terminology, Eka - Silicon is called

1. Phosphorous
2. Carbon
3. Germanium
4. Aluminium

Q.

The drawbacks of Mendeleev's Periodic Table are:

1. Position of Hydrogen was unclear

2. Position of Lanthanides and Actinides

3. Position of Isotopes

4. Anomalous positions of some elements

Q.

Mendeleev's Periodic law is based on

1. Atomic Number

2. No of e^-

3. Mass Number

4. Atomic mass

Q. The position of hydrogen atom was unclear in Mendeleev's periodic table.

1. True
2. False

Q. The position of hydrogen atom was unclear in Mendeleev's periodic table.

1. True
2. False

Q. Assertion :

1. Both assertion and reason are correct and reason is the correct explanation of the assertion.
2. Assertion is correct, but reason is incorrect.
3. Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
4. Assertion is incorrect, but reason is correct.
5. Both assertion and reason are incorrect.

Q.

Fill in the blanks based on features of Mendeleevs periodic table:

Mendeleev left gaps for elements that were not -------- at that time.