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| passed electricity through compounds. Compounds are held together by electrical forces and decompose into elements. |
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| reaction that occurs in electrolysis is proportionate to current passed through compounds |
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| changed cathode ray tube - added 2 adjustable voltage electrodes |
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| 1st American Nobel Laureate |
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| determined charge and mass of the electron |
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"canal ray" - streams of positively charged particles in cathode rays.
flow in opposite direction of cathode rays. |
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| postulated existence of protons |
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basic pic of atom
decoded scattering information |
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| recognized existence of neutrons |
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| recognized the Atomic # is the defining difference between elements |
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| 1st mass spectrograph: determined masses & abundances of elements |
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light is composed of particles/photons/energy packets
Energy is Everywhere |
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| electric current passing through a gas in a vaccum tube causes the gas to emit light |
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| impossible to determine simultaneously both position and momentum of an electron. |
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| emperical equation that relates the wavelengths of the lines in the emission spectrum |
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| electrons have wave-like properties |
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| verified wave-particle duality |
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| ground state electron configuration - electron that distinguishes an element from the previous element enters the lowest energy atomic orbital |
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| electrons occupy all orbitals of a given subshell singly before pairing begins. Unpaired electrons have a parallel spin. |
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