Biology Honors Nastasi Basic Chem

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Atom

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The smallest particle of a element

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Element

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A pure substance that cannot be broken down into simpler substances

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Atomic Number

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the number found above an element on a periodic table. Is equal to the total              protons in a nucleus.

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Atomic Mass

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the number found below an element on a periodic table.  Is equal to the           total protons and  neutrons in a nucleus.

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Proton

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positive charged particle found inside the nucleus

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(neutron) isotope

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Atoms with the same number of protons but different numbers of neutrons

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Neutron

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particle found in the nucleus with no charge

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Electron

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negative charged particle found outside the nucleus

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( Electrons) ions

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Atoms that have lost or gained electrons

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cations

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positively charged ion – lost electrons - metals