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how many groups and periods does the modern periodic table have

6 periods and 14 groups

7 periods and 18 groups

8 periods and 19 groups

9 periods and 20 groups

The modern periodic table of the elements contains 18 groups, or vertical columns. Elements in a group have similar chemical and physical properties because they have the same number of outer electrons. The periodic table consists of seven periods. The periods vary in length.

M

2

José Carlos genesismission.jpl.nasa.gov

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