Basic Concepts of Atoms and Molecules

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Atom

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The basic unit of matter.

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Electron

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A negatively charged particle found outside the nucleus.

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Element

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A pure substance that consists of only one type of atom.

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Isotope

Back

Atoms of the same element with different numbers of neutrons.

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Radioactive Isotope

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An isotope with an unstable nucleus that breaks down over time.

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Compound

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A substance formed by the chemical combination of two or more elements.

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Covalent Bond

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A chemical bond formed when atoms share electrons.

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Molecule

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A structure formed when atoms are joined together by covalent bonds.

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Van der Waals Forces

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Weak attraction between oppositely charged regions of nearby molecules.

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Hydrogen Bond

Back

A weak attraction between a hydrogen atom and another atom.