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| Makes up protons and neutrons |
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| Action of dividing or splitting something into two |
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| In the atom, electrons fill orbitals of the lowest available levels before higher levels. Then you start pairing. |
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| Every orbital in a sub shell is singly occupied with one electron before any one orbital is doubly occupied. |
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| Amount of energy required to remove an electron from an isolated atom or molecule. |
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| Chemical property that describes the tendency of an atom. Affected by both its atomic number and the distance that its valence electrons reside from the nucelli. |
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| Amount of energy liberated when an electron is added to a neutral atom to form a negatively charged ion. |
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| Emission of electrons from a surface caused by the action of light striking it. Amount of energy affects the level of light. |
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| Percentage of atoms with a specific atomic mass found in a naturally ocurring sample of an element. |
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| (Nuclear Notation) Allows us to use a visual symbol to easily determine an Isotope's mass #, atomic #, and to determine the # of neutrons and protons. |
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| Letter symbol first followed by subscript: has the number of charges on the ion followed by cations (+) or anions (-).No subscript for neutral ions. |
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| Atoms tend to form compounds in ways that give them 8 valence electrons. First noble gas and helium are an exception. |
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Groups 5-7 gain electrons
Group 1-3 lose electrons |
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