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| law of constant composition |
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Definition
| in a given compound the relative numbers and kinds of atoms are constant |
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| law of conservation of mass |
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Definition
| the total mass of materials present after a chemical reaction is the same as the total mass present before the reaction |
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| electrically charged substances; some with a + charge some with a - charge |
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| spontaeneous emission of radiation |
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| fast moving particle, 2+ charge, larger than beta rays |
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| high speed electrons. radioactive equivalent of cathode rays. 1- charge |
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| similar to xrays have no charge and does not consist of particles |
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| most of the mass of each gold atom and all of its positive charge reside in a very small, extremely dense region called the nucleus |
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| the number of protons in an atom |
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| the number of protons and neutrons in the atom |
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| atoms with identical atomic numbers but different mass numbers due to different number of neutrons |
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| Σ[(isotope mass) X (fractional isotope abundance)] |
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| arrangement of elements in order of increasing atomic number, with elements having similar properties placed in vertical columns |
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| horizontal rows of the periodic table |
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| the elements on the left and in the middle of table |
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| right of stepped line running from Boron to astatine (AT) |
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| elements on the stepline that have properties of both metals and nonmetals |
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| a molecule made up of two atoms |
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| compouds composed of molecules containing more than one type of atom |
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| chemical formulas that indicate the actual numbers of atoms in a molecule |
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| formulas that give only the relative number of atoms of each type in a molecule |
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| shows which atoms are attached to which |
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| electrons that are removed or added to an atom; charged particle |
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| + charge, easily gives away |
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| 1- charge, takes electrons |
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| ions that consist of atoms joined as in a molecule, have a positive or negative charge. |
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| a compoud made up of cations and anions, METALS AND NON METALS. metals form cats, non form anions |
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| elements that occur in the middle of the periodic table. usually form cations with different charges |
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