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| characteristics are color, hardness, flammability, smooth, etc. |
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| 2 or more substances NOT chemically combined |
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| can not be broken down to an element |
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| a substance that cannot be broken down into another substance by physical or chemical means |
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| a substance made of two or more elements chemically combined |
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| does not create a new material or change appearence |
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Term
(A) atom is a nucleus surrounded by negative electrons
(B) nuclei contains protons and neutrons
(C) protons are positive
(D) neutrons have no charge
(E) electrons - negative charge
(F) # of protons = # of electrons = atomic #
(G) # of neutrons is ca |
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| number of electrons on the outer shell (8 of these=stable) |
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| metals to the left of the zigzag line- each group has the same # of electrons (elements on the left are very reactive, those on the right side are least reactive; 8 valence electrons=stable) |
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| Periodic Table Organization |
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