Table and group of model period table
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Explanation:
No of groups = 18
No of periods = 7
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In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered. ... Groups may also be identified using their topmost element, or have a specific name.
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