T1L1: Modeling Atoms Vocab.

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Matter

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Anything that has mass and takes up space.

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Element

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A pure substance that cannot be broken down into other substances by chemical or physical means.

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Atomic Number

Back

The number of protons in the nucleus of an atom.

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Atomic Mass

Back

The average mass of all the isotopes of an element.

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Atomic Theory

Back

Theory that states that all matter in the universe is made up of minute particles called atoms.

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Electron

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A tiny particle that moves around the outside of the nucleus of an atom.

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Valence Electron

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The electrons that are in the highest energy level of an atom and that are involved in chemical bonding.

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Proton

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a small, positively charged particle that is found in the nucleus of an atom.

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Neutron

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A small particle in the nucleus of the atom, with no electrical charge.

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Hypothesize

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To make a scientific prediction or educated guess about what will happen in an experiment.