Q13 of 60 Page 138

Why is the atomic number of the element more important to a chemist than its atomic mass?

Atomic number represents the number of electrons in the element and also in electronic configuration and physical and chemical properties.


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11

What similarity do you observe in:

(i) Elements belonging to the same period.


(ii) Elements belonging to the same group.

 12

How is the valency of an element related to its electronic configuration? Explain giving suitable example.

 14

What is the similarity between elements Li, Be, B, C, N, O, F and Ne belonging to the second period?

 15

Chlorine and bromine are kept in the same group in the periodic table. Why?