Understanding science: what we cannot know: Week 2: Figure 1 Periodic table of elements. Elements are lined up by atomic number (the number of protons they have)

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Understanding science: what we cannot know

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This figure shows the periodic table. This is a tabular display that groups and numbers the 118 known chemical elements. An element’s location in the table relates to its reactivity and how its electrons are arranged.

Figure 1 Periodic table of elements. Elements are lined up by atomic number (the number of protons they have)

1 What is matter?

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