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How many groups are in the periodic table?
Quick Answer
There are 18 groups in the modern periodic table. Elements in the same group usually have similar outer-electron arrangements and similar chemistry.
The Full Story
The modern periodic table has 18 vertical columns called groups. These groups help organize elements with related properties, such as the alkali metals in group 1 and the noble gases in group 18. Group numbers reflect the repeating patterns of electron shells and valence electrons. This structure helps chemists predict how elements will bond and react. The group system is one reason the periodic table is useful far beyond memorizing names and symbols.
Key Facts
1.18 groups in the modern table
2.Group 1 includes lithium, sodium, and potassium
3.Group 18 includes helium, neon, and argon
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"Why columns in the table matter so much"
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