give four points explaining the outline of modern periodic table..
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Groups - There are 18 vertical columns in the periodic table. Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of valence electrons. Periods - In periodic table elements are arranged in a series of rows.
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it has 7 period
18 groups
left side = metals
zigzagline = metaloid
right side = non metal
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