Question

What are groups and periods how may groups and periods are there in modern periodic

Answer 1

18 groups

18 groupsThere are 18 groups and 7 periods in the modern periodic table. (a) The atomic size and metallic character of elements increase down a group. (b) The atomic size and metallic character of elements decrease from left to right in a period. the number of periods is 7 and the number of groups is 18.