Unit 3 Test
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1
Positively Charged
Alpha
2
Blocked by aluminum foil
Beta
3
Can pass through human skin
Gamma, Beta
4
Atomic Number = 0
Gamma
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Has a mass number of 4
Alpha
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Has a mass number of 0
Gamma
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Is an electron
Beta
8
Blocked by a pieace of paper
Alpha
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Has the highest energy
Gamma
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Is a helium nucleus
Alpha
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Average Atomic Mass
Mass x Decimal Number of %, then add all of them
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Protons = Electrons
Neutral Atom
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Protons>Electrons
Positive Charge
Positive Charge
Cation
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Protons<Electrons
Negative Charge
Negative Charge
Anion
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How to get # of protons
atomic number
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How to get # electron
Same as protons except if there is a charge
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How to get # neutrons
mass-protons
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He was the first to propose that matter was composed of small, indivisible particles called atoms
Democritus
He was the first to propose that matter was composed of small, indivisible particles called atoms
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Dalton
He developed the first complete atomic theory, stating that all matter is made of atoms, which are indivisible. All atoms of a given element are identical in mass and properties. Compounds are combinations of two or more different types of atoms
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J.J. Thomson
He discovered the electron and proposed the “plum pudding” model of the atom, which suggested that electrons were embedded in a positively charged "pudding"
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Millikan
He conducted the oil-drop experiment to determine the charge of an electron
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Rutherford
He discovered the nucleus of the atom and proposed a model where electrons orbit the nucleus
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Bohr
He improved upon Rutherford’s model by explaining that electrons move in fixed orbits around the nucleus
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Schrodinger
He developed the quantum mechanical model of the atom, which describes the behavior of electrons as waves
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Chadwick
He discovered the neutron, a particle in the nucleus with no charge9
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