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.
Subatomic Particles Protons and electrons are the only particles that have a charge. Protons and neutrons have essentially the same mass. The mass
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.
Slide 3
Isotopes Isotopes are atoms of the same element with different
masses. Isotopes have different numbers of neutrons.
Slide 4
Symbols of Elements nuclear General format for identifying a
particular nuclide
Slide 5
Symbols of Elements Elements are symbolized by one or two
letters.
Slide 6
Symbols of Elements All atoms of the same element have the same
number of protons, which is called the atomic number, Z.
Slide 7
Symbols of Elements The mass of an atom in atomic mass units
(amu) is the total number of protons and neutrons in the atom.
Slide 8
Symbols of Elements 12 C Nuclear SymbolHyphen notation
Carbon-12
Slide 9
Atomic Mass Atomic and molecular masses can be measured with
great accuracy using a mass spectrometer.
Slide 10
Atomic Mass
Slide 11
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
Slide 12
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