Q2 of 49 Page 124

What is the main difference between Mendeleev's and modern periodic law?

The main difference between the Mendeleev’s and modern periodic law is that Mendeleev considered the properties of elements as periodic function of their atomic masses while modern periodic law considers the properties of elements as periodic function of their atomic numbers.


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5

Why was the position of hydrogen not fixed in Mendeleev's periodic table?

 1

How many groups and periods are present in the modem periodic table?

 3

Elements of the same group have similar properties. Why?

 4

In which period and group would you place the elements with the following electronic configurations.

(i) 2,8 (ii) 2,5