Unit 2: Periodic Table Vocab

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Periodic table

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An organized arrangement of all of the elements of matter. Elements are arranged in order of increasing atomic number.

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Atomic number

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The number of protons in an atom. In a neutral atom, this is also the number of electrons.

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Atomic mass

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The combination of the mass of the protons and neutrons in an atom.

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Reactivity

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The property of matter that tells you how well an atom combines with other atoms to make compounds.

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Element

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A substance that cannot be broken down into simpler substances.

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Compound

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The combination of 2 or more different elements.

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Molecule

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The combination of 2 or more atoms.