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Definition
| mass number or atomic number written to the left of the atmoic number |
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| mass number of hyrogen that has a mass number of 3 |
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Definition
| number of periods in the modern day periodic table, horizantal rows |
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Definition
| vertical column of the periodic table |
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Definition
| equals the atomic number, has a positive charge |
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Definition
| equal to number of protons, orbits the nucleus and have a negative charge |
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Definition
| have a neutral charge, is equal to the mass number minus the number of protons |
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Definition
| based on increasing atomic numbers |
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Definition
| isotope of hydrogen that has a mass number of 2 |
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Definition
| atoms with the same nimber of protons but different numbers of nuetrons |
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Definition
| weighted average of the masses of its isotopes |
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Definition
| numbwer of protons and nuetrons |
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Definition
| early Greek philosopher who propsed the existence of atoms |
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Definition
| atoms combined in whole number ratios |
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Definition
| repels electrons in a cathode ray tube |
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| elements are composed of tiny indivisible particles that retain identity even after chemical reactions are called______ |
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Definition
| associated with discovering the nuetron |
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Term
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Definition
| positively charged plate in a cathode ray tube |
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Term
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Definition
| used Gold foil experiment to prove the existence of atoms in the nuclues |
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Definition
| physicist charged with the discovery of the electron |
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Term
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Definition
| word orignaly used by Thompson to describe the observed particles |
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Definition
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Definition
| smaller subneculear particles of protons an nuetrons |
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Definition
| attracts electrons in a cathrode ray tube |
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Definition
| performed experiments(oil drop)that helped determine the mass of an electron |
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Definition
| "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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Definition
| german scientist who first built a scanning electron microscope |
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Term
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Definition
| propsed the conccept of positively charged particles(protons) |
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Definition
| early philosphernwho said there were only four basic elements |
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Term
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Definition
| based the arrangment of elemnts on the periodic table on similar properties |
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Definition
| based the arragmeent of elements on the pereodic table on the unber of protons in each element |
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