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Common Groups and Periods of the Periodic Table

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All elements in the periodic table have a place based on their atomic number and they are sorted into different groups and periods based on their reactivity and physical properties.

Most groups in the periodic table have common patterns in reactivity. this is because they share common patterns in the number of electrons and shells but differ by the number of protons and neutrons. This section will seek to explore some of the wider patterns of reactivity.

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Group 1: The Alkali Metals

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