Question

differentiate between the arrangement of elements in Mendeleev periodic table and Modern Periodic Table

Answer 1

in mendeleev's periodic table he cant place hydrogen in correct place, he cant arrange the elements according to their atomic number but he arrange it in its mass number

Answer 2

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Mendeleev’s Periodic table:

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 1)      Arrangement of elements is on the basis of atomic masses

2)      It has 6 periods and 8 groups

3)      Inert gases are absent

4)      Transition elements are not separated

5)      Lanthanoides and actinoides are absent

6)      Position of element, that is periodic and group number are unpredictable.

Modern Periodic table:

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 1)      Elements are arranged on the basis of atomic mases

2)      It has 7 periods and 18 groups

3)      Inert gases are included in a separate group

4)      Transition elements are placed in a separate group

5)      These are present at the bottom of the table

6)      From electronic configuration, group number are the period number can easily be predicted. 

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