Demerits of Mendeleev's Periodic Table

Q.

List some of the advantages of the modern periodic table.

Q.

What Are The Defects In Mendeleev Periodic Table.

Q.

State achievement of Mendeleevs periodic table.

Q.

What is the purpose of the periodic table?

Q.

Why is the periodic table so called?

Q.

Modern periodic table also known as long form of periodic table has the atomic number of elements as the basis of classification .It is better than mendeleev’s periodic table in many respects because it had regarded atomic masses of element as the basis of classification which is not correct .Actually mass of an element is concentrated mainly in the nucleus of the atom and has very little to do with the properties in particular .Electrons involved in these and are linked with atomic numbers of the element.

How many groups and periods are present in the long form of periodic table?

Q.

Select the limitations of Mendeleev's periodic table from the given options.

1. Some elements with different properties were kept in the same group.

2. The position of Hydrogen was not fixed.

3. The arrangement of elements on the basis of increasing atomic masses was not always followed.

4. Empty spaces were left in the Mendeleev's periodic table in case some new elements were discovered.

Q. Which of these pairs were put by Mendeleev in the wrong order on the basis of increasing atomic mass in his table?

1. Oxygen and fluorine
2. Phosphorous and sulphur
3. Sodium and magnesium
4. Cobalt and nickel

Q.

What is a periodic table used for?

Q. Please give notes on modern periodic table, groups, periods and position of elements

Q.

Enlist the few uses of modern periodic table.

Q. Which of the following is an limitation of Mendeléev’s periodic table?

1. The noble gases could be accommodated in a different group of the periodic table without disturbing the existing order.
2. He predicted the existence of some elements that had not been discovered at that time.
3. 62 elements were grouped based on similarity in their chemical properties.
4. The position of hydrogen could not be fixed in the periodic table.

Q. Give reason: Properties of elements are periodic functions of their atomic numbers and not atomic weights
end

Q. Mendeleev placed isotopes in his periodic table.

1. False
2. True

Q. Which of the following is an limitation of Mendeléev’s periodic table?

1. The noble gases could be accommodated in a different group of the periodic table without disturbing the existing order.
2. He predicted the existence of some elements that had not been discovered at that time.
3. The position of hydrogen could not be fixed in the periodic table.
4. 62 elements were grouped based on similarity in their chemical properties.

Q.

Select the limitations of Mendeleev's periodic table from the given options.

1. Some elements with different properties were kept in the same group.
2. The position of hydrogen was not fixed.
3. The arrangement of elements on the basis of increasing atomic masses was not always followed.
4. Empty spaces were left in case some new elements were discovered.

Q. Mendeleev placed isotopes in his periodic table.

1. False
2. True

Q. Hydrogen exhibits the properties similar to both alkali metals and halogens.

1. True
2. False

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. 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.

What do you understand by the term periodic table?