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| THE SMALLEST CHARACTERISTIC PARTICLE OF AN ELEMENT |
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| AN ELECTRICALLY NEUTRAL UNIT OF TWO OR MORE ATOMS JOINED BY COVALENT BONDS; THE SMALLEST FUNDAMENTAL UNIT OF A MOLECULAR SUBSTANCE |
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| THE UNIT OF RELATIVE ATOMIC WEIGHTS, 1/12 THE MASS OF A CARBON-12 ATOM |
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| THE NUMBER OF PROTONS IN THE NUCLEUS OF AN ATOM OF AN ELEMENT |
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| THE SUM OF THE NUMBERS OF PROTONS AND NEUTRONS IN THE NUCLEUS OF AN ATOM |
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| LEVEL 1 = 2 LEVEL 2 = 8 LEVEL 3 = 18 |
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| A FUNDAMENTAL SUBSTANCE IN WHICH ALL ATOMS HAVE THE SAME NUMBER OF PROTONS |
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| A PURE SUBSTANCE MADE UP OF TWO OR MORE ELEMENTS COMBINED IN FIXED PROPORTIONS |
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| THE UNIT OF POSITIVE CHARGE IN THE NUCLEUS OF AN ATOM |
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| MATTER WITH A VARIABLE COMPOSITION |
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| AN INCREASE IN THE EARTH'S AVERAGE TEMPERATURE |
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| THE BAD THINGS THAT DEPLETE THE STRATOSPHERE |
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| DAMP CLIMATE, HIGHLY INDUSTRIALIZED REGION |
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O3-UV--> O2 + O
O+O2 --> O3 |
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| SMOG CREATED BY THE ACTION OF SUNLIGHT ON UNBURNED HYDROCARBONS AND NITROGEN OXIDES, MAINLY FROM CARS |
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| TREATY SIGNED THAT STARTED TO PHASE OUT CERTAIN SUBSTANCES (CHC'S) |
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| ATOMS THAT HAVE THE SAME NUMBER OF PROTONS BUT DIFFERENT NUMBERS OF NEUTRONS |
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| THE SUBATOMIC PARTICLE THAT EARS A UNIT OF NEGATIVE CHARGE |
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| A FUNDAMENTAL PARTICLE WITH A MASS OF APPROXIMATELY 1 U AND NO ELECTRIC CHARGE |
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| DISTILLING COMPONENTS INTO DIFFERENT PARTS BY BOILING POINT OR OTHER TEMPERATURES |
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| A HYDROCARBON WITH ONLY SINGLE BONDS; A SATURATED CARBON |
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| A HYDROCARBON CONTAINING ONE OR MORE DOUBLE BONDS |
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| A HYDROCARBON CONTAINING ONE OR MORE TRIPLE BONDS |
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| HYDROCARBON WITH ALTERNATING DOUBLE AND SINGLE BONDS BETWEEN CARBONS |
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