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27 Cards in this Set
- Front
- Back
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Thomson |
Discovering electrons |
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Dalton |
First atomic theory |
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Rurtherford |
Discovering nucleus |
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Democritus |
Concept of atoms |
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Chadwick |
Discovering neutrons |
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Rutherford |
Discovering protons |
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Crookes |
Discovering fluorescence |
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Neils Bohr |
First functional model |
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Robert Boyle |
Concept of elements |
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Atomic number |
Number of protons in the nucleus of an atom of that element |
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Mass number |
Protons + neutrons in nucleus of an atom |
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Number of electrons |
Number of protons in a neutral atom |
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Ions |
Will have unequal numbers or protons and electrons |
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Positive ions |
Less electrons |
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Negative ions |
More electrons |
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Electron |
Negatively charged subatomic particle |
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Atomic number(definition) |
The number of protons in the nucleus of an atom of an element |
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How to find neutrons |
Neutrons= mass number- atomic number |
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Orbital diagram |
Draw squares |
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Lewis(electron dot diagram |
Element symbol in middle, dots= same # as group |
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Neutrons |
Subatomic particles with no charge but with a mass nearly equal to that of a proton |
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(c), the speed of light |
C= the product of frequency and wavelength ( c=yv ) |
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Speed of light |
3.00×10^8 m/s |
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Wavelength |
M or m/ cycles |
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Frequency |
Hz or (Cycles/s) |
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Energy |
Joules(J) : 6.625×10^-34J.s |
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Nucleus |
Central portion of an atom composed of protons and neutrons |
