Atom Structure

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7 Terms

Proton

mass : 1

charge : + 1

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Electron

mass : 0

charge : -1

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Neutron

mass : 1

charge : no charge

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isotope

an atom with the same number of protons and a different number of neutrons

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mass number

number of protons and neutrons

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atomic number

number of protons

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Electron shells

electrons are arranged into shells that orbit the nucleus

the first shell has a maximum of 2 electrons

second shell has maximum of 8 electrons

third shell has maximum of 8 electrons

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