Question

Give the points of differences between mendeleev periodic table and modern form of periodic table

Answer 1

◆On the basis of grouping elements-

Mendeleev's periodic table - Mendeleev's grouped all the elements in his table according to their atomic mass.

Modern periodic table - All the elements in the modern periodic table are grouped according to their atomic number.

◆Position of hydrogen -

Mendeleev's periodic table - He could'nt specify the position of hydrogen in his table, this was a drawback in his table.

Modern periodic table - The problem of position of hydrogen was resolved in this table.

◆Position of isotopes -

Mendeleev's periodic table - When isotopes were discovered, those were not able to be fitted in his table.

Modern periodic table - The problem of positioning of isotopes were resolved.

◆Positoning of elements uniformly -

Mendeleev's periodic table - His table was not uniform.

Modern periodic table - All the elements in this table were arranged uniformly.

And one last difference is that in Mendeleev's table he grouped heavier elements before lighter elements but all the elements were uniform in modern periodic table.

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Answer 2

Answer:

• Mendeleev's periodic table

1. elements are arranged in increasing order of their atomic masses.
2. It is not divided into any blocks.
3. There are 8 groups.
4. Isotopes could not be placed properly.

• Modern periodic table

1. Elements are arranged in increasing order of their atomic numbers.
2. It is divided into four blocks, namely s-block,p-block,d-block and f-block.
3. There are 18 groups.
4. Isotopes occupy the same position as the element.

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