Question

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

Answer 1

There are 18 groups and 7 periods in the Modern Periodic Table. 

(i) # Atomic size increases # Metallic character increases 

(ii) # Atomic size decreases  #  Metallic character decreases