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14 Cards in this Set
- Front
- Back
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Isotope |
Atoms of the same element with different mass numbers. |
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Average Atomic Mass |
Weighted average of all isotopes. |
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Mass Number |
Number of protons plus the number of neutrons in an atom. |
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Kinetic Molecular Theory |
Particles of matter are always in motion; the kinetic energy of these particles increases as temperature increases. |
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Law of Definite Coposition |
A given compound always contains the same, fixed ratio of elements. |
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Law of Multiple Proportions |
Elements can combine in different rations to form different compounds. |
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Pauli Exclusion Principle |
Each orbital can hold TWO electrons with opposite spins. |
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Aufbau Principle |
Electrons fill the lowest energy orbitals first. |
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Hund's Rule |
With in a sublevel, place one e- per orbital before pairing them. |
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Core e- |
Go up one row and over to the Noble Gas. |
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Valence e- |
On the next row, fill in the # of e- in each sublevel. |
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Ground State |
When an electron is in it's lowest possible energy. |
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Excited State |
When an electron gains a photon and gains energy. |
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Photon |
Particle of light that carries a quantum of energy. |
