Atom Notes
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The 3 particles found in an atom are the proton, electron, and neutron.
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Protons have a positive charge and are found inside the nucleus.
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Electrons have a negative charge and are found outside the nucleus.
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Neutrons have no (zero) charge and are found inside the nucleus.
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The atomic mass is made up of the mass of both the proton and neutron.
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All the mass of an atom is found in the nucleus.
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The nucleus contains protons and neutrons.
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Electrons are found in the outer cloud called the electron cloud.
Remember APE:
Atomic number = # of Protons = # of Electrons Remember MAN: Atomic Mass – Atomic number = Number of Neutrons
• Energy Levels
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The first energy level can only hold 2 electrons.
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The second energy level can only hold 8 electrons.
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The third energy level can only hold 8 electrons.
Valence electrons are the electrons found in the outside energy level of the atom.