Biology 2-1: The Nature of Matter

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11 Terms

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Atom

Basic unit of matter

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Nucleus

Center of atom

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Electrons

Move in constant motion

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Element

Pure substance with one type of atom

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Atomic Number

Number of protons

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Isotopes

Same element, different neutrons

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Compound

Substance formed by combining two or more elements

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Atoms are held together by what chemical bonds

Ionic bonds, covalent bonds, van der waals forces

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Ionic bonds are formed

When electrons are transferred, and the attraction between oppositely charged ions

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Covalent bond

Electrons are shared between atoms, and can form single double or triple bonds

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Van der waals forces

Weak attraction between molecules caused by slight positive or negative charges