Term
| that could not be divided |
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Definition
| Democritus thought that matter was made of tiny particles |
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Term
| a tiny, solid sphere with a predictable mass for a given element |
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Definition
| What most accurately represents John Dalton's model of the atom? |
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Term
| contains negatively charged particles |
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Definition
| j.j. Thomson's experimnts provided evidence that an atom |
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Term
| there is a dense, positively charged mass in the center of an atom. |
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Definition
| Rutherfor's gold foil experiment provided evidence for what statement? |
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Term
| it is like a huge stadium with a positively charged marble in the center. |
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Definition
| What statementbest describes Rutherford's model of the atom? |
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Term
| an elctron has far less mass than either a proton or neutron |
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Definition
| what is a true statement about subatomic particles? |
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Term
| an elctron has far less mass than either a proton or neutron |
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Definition
| what is a true statement about subatomic particles? |
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Term
| 2.the number of protons in the nucleus does not equal the number of neutrons. |
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Definition
Suppose an atom has a mass number of 35. Which statement is true beyond any doubt?
1.the is not an isotope
2.the number of protons in the nucleas does not equal the number of neutrons
3. the atomic number is less than 17 |
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Term
| they are isotopes of oxygen |
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Definition
| which statement is true about oxygen-17 and oxygen-18? |
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Term
| it decribed a nucleus surrounded by a large volume of space |
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Definition
| how was Bohr's atomic model similar to Rutherford's model? |
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Term
| electrons travel around the nucleus in fixed energy levels with energies that vary from level to level |
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Definition
| which statement accurately represents the arrangement of electrons in Bohr's atomic model? |
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Term
| move from higher to lower energy levels |
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Definition
| the glowing of a neon light is caused by electrons emittiing energy as they |
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Term
| atoms contain subatomic particles |
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Definition
| what is NOT a true part of John Dalton's atomic theory? |
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Term
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Definition
| who provided evidence for the existence of a nucleus in an atom? |
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Term
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Definition
| who provided evidence for the existence of a nucleus in an atom? |
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Term
| concentrated in the centerof an atom |
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Definition
| in an atomic model that includes a nucleus , positive charge is |
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Term
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Definition
| what subatomic particle has a negative charge? |
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Term
| protons and nuetrons have the same charge |
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Definition
| what is not true is about about subatomic particles? |
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Term
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Definition
| the number of protons in one atom of an element is that element's |
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Term
| atomic number from the mass number |
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Definition
| to find the number of neutrons in an atom, you would subtract the |
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Term
| like planets orbiting the sun |
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Definition
| in Niels Bohr's model of the atom, electrons move |
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Term
| the electron has gained energy |
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Definition
| what can you assume has happened if an electron moves to a higher energy level? |
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Term
| the most likely locations of electrons in atoms |
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Definition
| what does the electron cloud model describe? |
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Term
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Definition
| The region in which an electron most likely to be found is called an______. |
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Term
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Definition
| John Dalton concluded that all the atoms of a single _____ have the same mass. |
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Term
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Definition
| Protons and ____are found in the nucleus of an atom. |
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Term
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Definition
| If element Q has 11 protons, its atomic____is 11. |
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Term
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Definition
| The nuclei of isotopes contain different numbers of ______. |
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Term
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Definition
| in Bohr's model of the atom, ____ move in fixed orbits around the nucleus. |
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Term
| 1st one about idea of atom-Democritus thought that matter was made of tiny particles |
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Definition
| what did Democritus believe about matter? |
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Term
| it showed him that the atom could be divided |
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Definition
| How did the results of J.J. Thomson's experiments change how scientists thought about atoms? |
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Term
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Definition
| What did Rutherford conclude about the location of positive charge in an atom? |
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