Subatomic Particles Protons and electrons are the only particles that have a charge. Protons and...
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- Subatomic Particles Protons and electrons are the only
particles that have a charge. Protons and neutrons have essentially
the same mass. The mass of an electron is so small we ignore
it.
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- Isotopes Isotopes are atoms of the same element with different
masses. Isotopes have different numbers of neutrons.
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- Symbols of Elements nuclear General format for identifying a
particular nuclide
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- Symbols of Elements Elements are symbolized by one or two
letters.
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- Symbols of Elements All atoms of the same element have the same
number of protons, which is called the atomic number, Z.
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- Symbols of Elements The mass of an atom in atomic mass units
(amu) is the total number of protons and neutrons in the atom.
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- Symbols of Elements 12 C Nuclear SymbolHyphen notation
Carbon-12
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- Atomic Mass Atomic and molecular masses can be measured with
great accuracy using a mass spectrometer.
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- Atomic Mass
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- Average Mass Because in the real world we use large amounts of
atoms and molecules, we use average masses in calculations.
IsotopeMass (amu)Natural abundance (%) Neon-2019.992490.4838
Neon-2120.99400.2696 Neon-2221.99149.2465
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- Average Mass Average mass is calculated from the isotopes of an
element weighted by their relative abundances. IsotopeMass
(amu)Natural abundance (%) Neon-2019.992490.4838
Neon-2120.99400.2696 Neon-2221.99149.2465