Q3 of 49 Page 124

Elements of the same group have similar properties. Why?

Elements present in the same group have a same number of electrons in their valence shells. On moving down a group, the number of shells increases but the number of electrons in the valence shell remains the same. That’s why the elements of the same group have similar properties.


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1

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

 2

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

 4

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

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

 5

How does the atomic size of the elements very along a period?