Question

How many groups and periods are there in a periodic table? How do the atomic size and metallic character of elements vary as we move :
(a) down a group and
(b) from left to right in a period ​

Answer 1

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

Atomic size increases down a group and decreases along a period

Metallic character increases down a group and decreases down a period

Answer 2

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