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Unit 9 · Matter

Elements and Atoms

ScienceSubject

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Unit 9 topics

Matter and Density Relative Density, Floating and Sinking Elements and Atoms Molecules and Compounds Physical and Chemical Change

Quick Facts

Unit: 9: Matter
Topic: Elements and Atoms
Domain: Chemistry

Protons decide the identity

Study Tip

When a question asks which element an atom is, look only for the protons or the atomic number. The neutron count never identifies anything, and if a question gives you only the neutrons, the honest answer is that you cannot tell.