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 ?
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.
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There.are 18 groups and 7 periods in the modern periodic table.
(i) Atomic size generally increases down a group due to the addition of the new shell and Metallic Character also increases down a group due to the increase in the tendency to lose electrons.
(ii) Atomic size goes on decreasing along a period from left to right.
Metallic character decreases along a period due to a decrease in tendency to lose electrons.
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