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

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

  1. Down a group: The atomic size and the metallic character of the elements increases down a group.
  2. From left to right in a period: The atomic size and the metallic character of elements decreases from left to right in a period.

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