Scientist who contributed to the modern atomic theory.
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| show | Democritus
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| Said atoms are small, hard particles. | show 🗑
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| show | Democritus
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| Atoms of different elements are different. | show 🗑
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| show | Dalton
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| show | Dalton
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| He wanted to know why elements combine is specific proportions. | show 🗑
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| He conducted experiments in combining elements. | show 🗑
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| His theory of the atmoic structure led to the "plum-pudding" model. | show 🗑
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| There are small negatively charged particles inside the atom. | show 🗑
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| He conducted the cathode-ray tube experiment. | show 🗑
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| Most of an atom's mass is in the nucleus. | show 🗑
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| show | Rutherford
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| There is a small, dense, positively charged nucleus. | show 🗑
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| show | Rutherford
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| show | Rutherford
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| show | Bohr
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| show | Bohr
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| show | Schrodinger and Heisenberg
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| show | Schrodinger
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| In physical science, an atom's central region, which is made up of protons and neturons. | show 🗑
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| show | Periodic
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| show | Mass number
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| show | Group
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| One of the elements of Group 2 of the periodic table(beryllium, magnesium, calcium, strantium, barium, and radium). | show 🗑
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| ONe of the elements of Group of the periodic table(helium, neon, argon, krypton, xenon, and radon);are unreactive. | show 🗑
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| ONe of the elements of Group 1, of the periodic table(lithium, sodium, potassium, rubudium, cesibium, and fancium) | show 🗑
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| An atom that has the same number of proton(or the same atom number) as other atoms of the some element do but that has a drift aren;tnumber of neutrons(and thus a different atomic mass). | show 🗑
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| show | Halogen
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| show | Period
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| show | Atomic Number
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| A region around the nucleus of an atom where electrons are likely to be found. | show 🗑
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| A unit of massthat describes the mass of an atom or molecule. | show 🗑
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| show | Atom
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| show | Neutron
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| A subatomic particle that has a positive charge and that is found in the nucleus of an atom. | show 🗑
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| THe mass of an atom expressed n atomic units. | show 🗑
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| THe law that states that the repeating chemical and physical proporties of elements change periodically with the atomic numbers of the elements. | show 🗑
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| A subatomic particle that has a negative charge. | show 🗑
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