1.

The physical and chemical properties of elements are periodic functions of their atomic numbers. 1. The atomic number of an element ‘X’ is 19. Write the group number, period and block to which X’ belong in the periodic table. 2. Name the element with (i) highest electronegativity and (ii) highest electron gain enthalpy

Answer»

1. The element is K. 

19K= 1s² 2s² 2p 3s² 3p6 4s1 

Group number = 1 

Period number = 4 

Block = s-block

2. (i) Fluorine 

(ii) Chlorine



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