7 periods and 12 groups
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There are 18 groups in the Periodic Table that categorize elements based on their similar chemical properties._rows."
There are 18 groups and 7 periods in the periodic table. Groups indicate the number of valence electrons an element has, while periods indicate the number of electron shells an element has.
There are 7 periods and 18 groups on the modern periodic table. Periods refer to horizontal rows while groups refer to vertical columns on the table.
The horizontal rows on the periodic table are called periods, while the vertical columns are called groups or families.
There are 18 groups of elements in the periodic table, each representing a column of elements that share similar properties.
Periods on the periodic table are the horizontal rows running from left to right. There are 7 periods in total on the periodic table. Each period represents the principle energy level of the elements.