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Physical Science CH4
Atomic Structure Vocabulary
Question | Answer |
---|---|
Define nucleus. | A dense, positively charged mass located in the center of the atom. |
Define electron. | A negatively charged subatmoic particle that is found in the space outside the nucleus. |
Define atomic number. | The number of protons an element has. |
Define mass number. | THe sum of the protons and nuetrons in the nucleus of an atom. |
Define electron cloud. | Visual model of the most likely locations for electrons in an atom. |
Define ground state. | When all electrons in an atom have the lowest possible energies. |
Define Dalton's Atomic Theory. | Matter is made up of individual particles called atoms, which can not be divided. |
Define Thomson's Model of the Atom. | Atoms are made of even small particles. |
Define Rutherford's Atomic Theory. | An atom's positive charge is concentrated in its nucleus. |
Define Bohr's Model of the Atom. | Electron's move in spherical orbits at dixed distances from the nucleus. |