. How many groups and periods are there in the modern periodic table


How  many  groups and  periods are  there  in the  modern periodic table?  How  do  the atomic  size  and  metallic character of elements vary  as we move:

 

(i) down a group and  (ii) from  left  to right in a period

Best Answer

There are 18 groups and  7 periods in the modern periodic  table

 

(i) Atomic size and  metallic character of the elements increases  down a group

 

(ii) Atomic size and metallic character of elements decreases  from left to right in a period

 

Metallic character of the element is decreased

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