11781576
Descripción
Fichas por Holly Nephew, actualizado hace más de 1 año
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Creado por Holly Nephew
hace más de 6 años
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| Pregunta | Respuesta |
| What did Democritus believe? | Atoms are indivisible and indestructible. |
| What were the problems with Democritus' theories? | They were not based on the scientific method and did not explain chemical theory. |
| What were the elements of Dalton's atomic theory? | |
| Between what range do the radii of most atoms fall into? What instruments can be used to view them? | scanning tunneling microscopes |
| What are the three types of particles? | protons, neutrons, and electrons |
| Who discovered the electron and how? | J. J. Thomson, the cathode ray could be deflected with negative charges and was attracted to positive charges |
| What did Robert Millikan discover? | He calculated the mass of an electron, which is 1/1840 the mass of a hydrogen atom. |
| Who discovered canal rays and, consequently, the proton? | Eugen Goldstein |
| What did James Chadwick discover? | neutrons |
| What was J. J. Thomson's atomic model? | The Plum Pudding Model |
| What took place in Ernest Rutherford's gold foil experiment and what did he conclude? | A narrow beam of positive alpha particles was aimed at sheets of gold foil. Many passed through, but some deflected at wide angles, signalling similar charges pushing each other away. He concluded that large empty spaces allowed the particles to pass through while a small, positive area in the middle caused violent deflection. This was the nucleus. |
| What are the characteristics of Rutherford's "nuclear atom" model? | The nucleus is composed of protons and neutrons. Electrons are scattered outside of the nucleus and take up almost all of the volume of the atom. |
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