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| theorized that matter is composed of small particles |
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| assigned the concepts of positive and negative and to electric charges |
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proposed the atomic theory:
1.all matter is composed of atoms
2. all atoms of a GIVEN ELEMENT are identical
3. compounds are made of different atoms which are combined in small whole number
4. in chemical reactions atoms are rearranged but not created or destoryed |
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| isolated radium and polonium and discovered radioactivity |
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NAME THAT MAN:
J.J. Thompson |
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| discovered the electron, concluded that it has mass |
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-discovered the proton
-Defined the nucleus of the atom as a dense central core with a positive charge |
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| What did Rutherford discover in his famous alpha-particle scattering experiment? |
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-nucleus is the densest part of the atom
-what was in them was a positive charge |
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| mass of g in 1 mol of an element |
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| what is an atomic mass unit? |
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| 1/12 the mass of an atom that has 6 protons and neutrons |
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| why are protons and neutrons close to 1u? |
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| helps to approximate the mass of an atom |
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What does all of this stuff mean?
A\/
Z/\ |
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Atomic mass ELE
Atomic # MENT |
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| found charge of electron to determine mass |
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| which is bigger: protons, neutrons, or electrons? |
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| three kinds of radiation? |
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