Question

write short note on mendeleev's periodic law

Answer 1

The Mendeleev's periodic law states that the physical and chemical properties of the element can be reoccurred according to the atomic weights of the elements arranged in the periodic table.

The elements are considered as the periodic functions of their atomic weights. The elements will reoccur in a systematic and predictable way in the increasing order of their atomic number.

There is a variation in the atomic structure of the elements due to their properties. 

Answer 2

Mendeleev's Periodic table .

→ When Mendeleev started his work , 63 elements were known at that time .

→ He examined the relationship between the atomic masses of the elements and their physical and chemical properties .

→  Mendeleev concentrated on the compounds formed by elements with oxygen and hydrogen .

Classification criteria :-

1. The formulae of the hydrides and oxides formed by an element were treated as one of the basic properties of an element foe its classification.

2. He then took 63 cards and on each cards he wrote down the properties of one element. He sorted out the elements with similar properties and pinned the cards todether on the wall .He observed that most of the elements got a place in the periodic table and were arranged in the order of increasing atomic masses .

On this basis , Mendeleev formulated a periodic law .

→ Which states that " The properties of elements are the periodic function of their atomic masses .

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