Merits of Mendeleev's Periodic Table

Q.

The basis of Modern periodic table is

1. Atomic volume.

2. Atomic number

3. Atomic weight

4. Atomic size.

Q.

According to Lother Meyer, how should we arrange the elements in increasing order?

Q. Based on the statements given below, choose the correct one’s regarding limitations of Mendeleev’s periodic table.​
​
I. The position of hydrogen in the periodic table was uncertain.​
II. Isotopes of elements were not given different positions in the table.​
III. In the arrangement of Te and I, the increasing order of atomic mass was not obeyed.

Q. The elements named Eka aluminium and Eka silicon respectively by Mendeleev later turned out to be _____ and _______.

1. boron and carbon
2. sodium and potassium
3. gallium and germanium
4. lead and gold

Q.

What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which posed a challenge to Mendeleevs Periodic Law.

Q.

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

Q.

Give a one-word answer.

The Law which, states the properties of elements are the periodic function of their atomic masses.

Q.

Identify the elements that weren't arranged in the increasing order of atomic mass in the Mendeleev's periodic table.

1. Titanium and Vanadium

2. Tellurium and Iodine

3. Potassium and Calcium

4. Cobalt and Iron

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.

Identify the elements that weren't arranged in the increasing order of atomic mass in the Mendeleev's periodic table.

1. Tellurium and Iodine

2. Potassium and Calcium

3. Cobalt and Iron

4. Titanium and Vanadium

Q. What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively?

1. Eka-aluminium and Eka-boron
2. Eka-aluminium and Eka-silicon
3. Eka-boron and Eka-aluminium
4. Eka-silicon and Eka-aluminium

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. What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively?

1. Eka-aluminium and Eka-silicon
2. Eka-silicon and Eka-aluminium
3. Eka-boron and Eka-aluminium
4. Eka-aluminium and Eka-boron

Q. State true or false.
Gallium and germanium (discovered later) are placed below aluminium and silicon in their respective groups. The names of Gallium and Germanium as given by Mendeleev are Eka-aluminium and Eka-silicon.

1. True
2. False

Q. Which of the following are the merits of the Mendeleev's periodic table?

1. Vacant slots were kept for elements not discovered back then.
2. Elements with similar properties were kept in the same group.
3. The position of hydrogen was finally fixed.
4. Corrections in the atomic masses of certain elements were made.

Q.

Identify the elements that weren't arranged in the increasing order of atomic mass in the Mendeleev's periodic table.

1. Potassium and Calcium

2. Cobalt and Iron

3. Tellurium and Iodine

4. Titanium and Vanadium

Q. [TBQ.VI.(3)]
What are the limitations of Mendeleev’s periodic table?

Q.

What was wrong with the classification by Mendeleev?

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