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