Question

Difference between Mendeleev periodic table and the modern periodic table..

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Answer 1

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Here is the Answer..

• Mandeleev's Periodic Table

In his periodic table, mendeleev arranged all the then known 63 elements in the order of increasing atomic masses in horizontal rows but in such a way that elements having similar properties came directly under one another in the same vertical column or group.

There where 7 periods (horizontal rows) and eight groups (vertical columns) in the original periodic table of Mendeleev.

• Modern Periodic Table

Modern periodic table was prepared by Bohr. In the modern periodic, table the elements are arranged in the order of increasing atomic numbers in horizontal rows called periods.

Under each element all the elements having the same number of valence electrons are placed so that all the elements having same number of valence electrons come in the same vertical column or group.

Thus, the arrangement of elements in the modern periodic table is based on the electronic configurations.

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Answer 2

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Mendeleev periodic table

1. There are 8 groups .

2.It is based on atomic mass .

3.No place could be assigned to isotopes .

4.No distinction was made between metals and non metals .

Moderm periodic table

1.There are 18 groups .

2.It is based on atomic number of elements .

3.Isotopes of an element are assigned .

4.Distinction is made between metal and non metal .