Mendeleev's Classification Process

Q.

What are the advantages of Mendeleevs periodic table over others?

Q.

Mendeleev’s periodic law is based on

1. Number of electron

2. Atomic Number

3. Atomic mass

4. None of the above

Q.

Number of groups and periods in long form of periodic table.

Q. How many elements were discovered till the time when Mendeleev made the periodic table?

1. 126
2. 63
3. 113
4. 90

Q.

What are the similarities between the modern periodic table and Mendeleevs periodic table?

Q. In Mendeleev’s periodic table, the vertical columns are called and horizontal rows are referred to as .

1. groups
2. periods
3. rows
4. columns

Q. Question 30
In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

Q.

What was the Mendeleev’s basis for the classification of elements?

Q.

In the classification of the then known elements, Mendeleev was guided by two factors. What are those two factors?

Q.

State whether the following statements are true or false :

(a) Newlands divided the elements into horizontal rows of eight elements each.

(b) According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic numbers.

(c) The elements in a group have consecutive atomic numbers.

Q.

What is the basis of classification of elements in mendeleevs periodic table?

Q.

What were the criteria for the classification of elements in Mendeleev's Periodic Table?

1. mass number

2. valence electrons

3. atomic number

4. number of shells

Q.

Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.

Q.

According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of:

1. increasing atomic number

2. decreasing atomic number

3. increasing atomic masses

4. decreasing atomic masses

Q.

Answer the following questions regarding the modern version of Mendeleevs periodic table.

How many elements are in first period? Name the elements.

Q.

At present, ___________ elements are known to us, out of which ____________ are naturally occuring.

Q.

There are -------- periods in Mendeleevs periodic table.

Q. Classification of periodic table based on atomic number is given by:

1. Mosley
2. Both A and B
3. None of these
4. Mendeleev's

Q.

Which among the following chemical characteristics of elements was used by Mendeleev for giving the classification of his periodic table?

1. Sulphates

2. Nitrides

3. Oxides

4. Carbonates

Q.

Question 3
What were the criteria used by Mendeleev in creating his periodic table?

Q.

Identify the correct statement about Nickel and Cobalt according to the Mendeleev’s periodic table.

1. Ni was placed before Co.
2. Co was placed before Ni.
3. Both were placed in the same group.
4. Ni and Co were not discovered.

Q. What was Mendeleev's basis of classification of elements?

Q. Question 52
Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at “Periodic Law”?

Q.

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

The horizontal rows are called --------

Q.

Answer the following questions regarding the modern version of Mendeleevs periodic table.

What is the sixth period commonly called and why?

Q. For which of the following elements the sequence of increasing atomic masses was inverted in Mendeleev’s periodic table?

1. Cobalt (Co) and nickel (Ni)
2. Lithium (Li) and sodium (Na)
3. Beryllium (Be) and magnesium (Mg)
4. Potassium (K) and calcium (Ca)

Q. On what basis did Mendeleev classified the elements?

Q.

Answer the following question regarding the modern version of Mendeleevs periodic table.

How are the groups numbered?

Q. In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?

Q.

State Mendeleevs periodic law.