The Idea of Groups and Periods
18 groups · 7 periods · Two directions of one table
What groups and periods are and how many there are
Why elements in one group behave alike
How size, valency and metallic character change
A vertical column is a group, holding elements of similar properties.
A horizontal row is a period, where properties change step by step.
The table carries 18 groups and 7 periods.
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