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chem
| Question | Answer |
|---|---|
| what did Democritus think. | thought matter could not be divided indefinitely. |
| what did Aristotle think. | thought that matter was made of four “elements”: earth, fire, water, air. |
| John Dalton was known as what | Father of Atomic Theory. |
| was Aristoltle way of thinking correct or incorrect. | Aristotle was wrong. However, his theory persisted for approx. 2000 years due to his popularity. |
| John daltan revies the idea of ? | The atom |
| Daltans model was called? | Cannon ball model. |
| Exceptions to Dalton’s Theory | Atoms can be divided,Isotopes exist |
| J.J. Thomson was famous for which model? | Plum pudding |
| JJ Thompson discovered what | Discovered electrons. |
| What exsperiment is JJ thompspn famous for. | Cathode Ray Experiment |
| atoms must contain what | electrons |
| Rutherford’s Experiment Proves | A nucleus exists: small, dense and positive. Most of the atom is empty space |
| what model is Bohr’s popular for. | Planetary Model . |
| Electrons are located where? | in orbits around the nucleus. |
| who was Erwin Schrodinger | the exact location of an electron cannot be pin-pointed; it is more accurate to view the electrons in regions called orbitals. |
| who was James Chadwick | Realized that the atomic mass of most elements was double the number of protons |
| Schrödinger and heiseneburg were responsible for which model. | Quantum Mechanical Model. |
| How can you tell the difference between an atom and an ion just by looking? | Atoms do not have a charge, ions do have a charge. |
| What part of the atom can always be used to identify which element the atom came from? | # of protons |
| Why do atoms have neutrons? | to keep the protons near one another |
| How is a mass number different from an atomic number? | Mass number refers to the number of protons added to the number of neutrons. Atomic number refers to the protons only. |
| How does the mass, in amu, of a proton compare the mass of a neutron? | They are the same (both are 1 amu) |
| How does the mass, in amu, of an electron compare to the mass of a proton or neutron | The mass of an electron is 1/1836 of a proton or neutron. Electrons have much less mass than protons or neutrons. |
| Why are atoms neutral? | The number of protons (+) equals the number of electrons (-) |
| Describe where we find protons, neutrons and electrons in an atom. | Protons and neutrons are located in the nucleus of an atom. Electrons are located outside of the nucleus in orbitals. |
| Explain how isotopes of an atom are both similar and different | Similar - same atomic number, same number of protons Different- different mass number, different number of neutrons |
| Explain how an atom becomes a (+) ion and how an atom becomes a (-) ion. | (+) ion - atom loses 1 or more electrons (-) ion- atoms gains 1 or more electrons |
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Legend12828181
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