Question

What are the essential features of Mendeleev's Periodic Table ?? ( plz reply fast )

Answer 1

Mendeleevs periodic table :
Elements were arranged in order of their increasing atomic weights in horizontal rows called periods.
Elements were arranged in vertical columns called groups according to their resemblance in properties.
The periodic table had 8 groups and 7 periods.
Since only 63 elements were known at that time, he had left gaps for undiscovered elements.
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Answer 2

the horizontal rows present in the periodic table are called periods.there are seven periods in a table
Elements were arranged in vertical columns called groups according to their resemblance in properties.
The periodic table had 8 groups and 7 periods
.Since only 63 elements were known at that time, he had left gaps for undiscovered elements.