Q18 of 30 Page 196

Why is K more reactive than Li?

K is more reactive than Li because the size of K is bigger than Li and due to this bigger size, the effective nuclear charge decreases so the attraction of nucleus on valence electrons also decreases. So K loses its valence electrons more easily than Li.


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16

This question refers to the elements of the periodic table with atomic numbers 3 to 18.

(a) (i) Which of them are noble gases?


(ii) Which of them are halogens?


(iii) Which of them are akali metals?


(iv) Which are the elements with valency 4?


(b) An element with atomic no. 3 combines with another element with atomic number 17; what would be the formula of the compound?


(c) What is the electronic configuration of an element with atomic number 10?

 17

Give the symbols for:

(i) a metal of group 2


(ii) a metal of group 13


(iii) two non-metals of group 16


(iv) most reactive non-metal group 17.

 19

Why He, Ne and Ar called inert gas?

 20

Which one has larger atomic size– Cl or Br? Why?