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21 Cards in this Set
- Front
- Back
Democratis's Atomic Model/ Theories |
-atom is smallest unit of a substance that cannot be split -atoms are solid, homo, indivisible -different groupings result in different types of matter |
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Dalton's Atomic Model/Theories |
-all matter is composed of atoms -atoms cannot be created, divided or destroyed -law of conservation of mass |
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Thomson's Atomic Model/Theories |
-cathode ray tube experiment |
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Rutherford's Atomic Model/Theories |
-discovered dense, positively charged nucleus using gold foil experiment -work led to discovery of 3 types of radiation, alpha (+), beta (-) and gamma |
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Bohr's Atomic Model/ Theories |
-electrons orbit in energy levels |
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Chadwick's Atomic Model/ Theories |
-discovered neutrons -same mass as protons ^ |
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Schrodinger's Wave Mechanical Model |
1) Electrons (e-) are housed in orbitals 2) E- randomly jump around in their orbitals 3) Orbitals are assigned by energy levels |
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Energy given off in bright line spectrum= . . . |
Photons of energy, dependent on energy levels |
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What is an isotope? |
Different versions of the same element, different mass due to different # of neutrons Example: C-12 and C-14 |
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How do atoms become ions? |
Electrons are lost or gained |
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What are the 2 types of atoms? |
1) Cations (+) lose electrons 2) Anions (-) gain electrons |
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Long wavelengths have . . . |
Low frequency, low energy |
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Short wavelengths have . . . |
High frequency, high energy |
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What is the smallest particle of an element that maintains the properties of the element? |
Atom |
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Which particle has a mass that is almost the same as the mass of a proton? |
Neutrons |
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When does the number of protons = the number of electrons? |
In a neutral atom |
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What is the mass, charge, and location of a proton? |
-Mass=1 amu -Positive -Located in nucleus |
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What is the mass, charge, and location of a neutron? |
-Mass= 1 amu -Neutral -Located in nucleus |
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What is the mass, charge, and location of an electron? |
-Mass= 0 amu -Negative -Located in orbit |
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What is an atomic number? |
The # of protons. (If the atom is neutral, #p+ is equal to #e-) |
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How do you write an isotopic name? |
The name of the element followed by the isotope's mass # (Ex: oxygen-16) |