Chapter 4 Atomic Structure – Flashcards
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| subscript |
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| mass number or atomic number written to the left of the atmoic number |
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| tritium |
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| mass number of hyrogen that has a mass number of 3 |
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| seven |
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| number of periods in the modern day periodic table, horizantal rows |
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| group |
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| vertical column of the periodic table |
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| protons |
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| equals the atomic number, has a positive charge |
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| electrons |
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| equal to number of protons, orbits the nucleus and have a negative charge |
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| nuetrons |
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| have a neutral charge, is equal to the mass number minus the number of protons |
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| elements |
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| based on increasing atomic numbers |
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| deuterium |
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| isotope of hydrogen that has a mass number of 2 |
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| hydrogen |
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| lightest element |
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| isotopes |
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| atoms with the same nimber of protons but different numbers of nuetrons |
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| atomic mass unit(amu) |
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| weighted average of the masses of its isotopes |
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| mass number |
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| numbwer of protons and nuetrons |
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| democritus |
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| early Greek philosopher who propsed the existence of atoms |
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| compounds |
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| atoms combined in whole number ratios |
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| negativly charged plate |
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| repels electrons in a cathode ray tube |
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| nucleus |
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| cantral core of an atom |
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| atoms |
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| elements are composed of tiny indivisible particles that retain identity even after chemical reactions are called______ |
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| Chadwick |
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| associated with discovering the nuetron |
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| anode |
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| positively charged plate in a cathode ray tube |
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| Rutherford |
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| used Gold foil experiment to prove the existence of atoms in the nuclues |
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| Thompson |
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| physicist charged with the discovery of the electron |
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| corpuscles |
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| word orignaly used by Thompson to describe the observed particles |
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| nano scale |
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| the "atomic" scale |
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| quarks |
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| smaller subneculear particles of protons an nuetrons |
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| positively charged plate |
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| attracts electrons in a cathrode ray tube |
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| Millikan |
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| performed experiments(oil drop)that helped determine the mass of an electron |
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| Dalton |
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| "father" of the atomic theory and first to apply experimentations to conclusions and stated the chemicals can combine in whole-number ratios |
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| Rusacka |
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| german scientist who first built a scanning electron microscope |
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| Goldstein |
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| propsed the conccept of positively charged particles(protons) |
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| Socrates |
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| early philosphernwho said there were only four basic elements |
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| Mendeleev |
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| based the arrangment of elemnts on the periodic table on similar properties |
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| Moseley |
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| based the arragmeent of elements on the pereodic table on the unber of protons in each element |
