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-a substance that consists of identical atoms
-cant be broken down into simpler substances except to particles that make up all elements
-116 known elements |
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| -unique substances composed of two or more elements that are chemically combine {in a fixed proportion by weight and number of atoms} |
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-physical combination of 2 or more substances
-proportion variable |
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1. matter is composed of small individual particles (atoms)
2. Atoms of the same element are identical and have the same properties
3. atoms of the same element are different from those of other elements
4.atoms form molecules
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| Law of Conservation of Mass |
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| Law of constant composition |
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| a specific compound is always made up of elements in the same proportion by mass |
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| shiny, ductile, malleable, conduct electricity |
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| non-conducting soft solids, liquids, gases |
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| principle energy levels/ shells |
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increase left-right
decrease top-bottom |
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decrease left-right
increase top-bottom |
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| tightly bound groups of atoms which act as a unit |
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Definition
-smallest particle of an element which still has the properties of the element
-made up of electrons, protons, and neutrons |
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| law of conservation of mass |
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Definition
| matter is neither created or destroyed |
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| elemental form- monatomic |
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| elemental form- polyatomic |
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