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14 Cards in this Set
- Front
- Back
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What is a control group?
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A group of individuals who are treated identically to the experimental group with one exception.
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What are variables?
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Characteristics of your experimental system that are subject to change.
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What does a nucleus contain?
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A proton, which has a large, positive charge, and a neutron, which has no charge, and an electron cloud.
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All of the elements are represented by a symbol, X (or Na, Cl, etc) and then numbers on every corner of the element. If numbered 1 through 4, starting on the bottom left corner and moving clockwise, what does each number represent?
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1= the atomic #, 2= atomic mass (the atomic mass is the number of protons plus the number of neutrons), 3=charge (+ or -), and 4=the number of atoms in a molecule.
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How do electrons exist?
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In energy states called shells.
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What is a neutral charge in an atom?
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The p+=e-
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Unless written otherwise, the charge of an atom is always _____
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Neutral
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How many electrons are in the first shell of an atom?
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Two
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All of the elements are represented by a symbol, X (or Na, Cl, etc) and then numbers on every corner of the element. If numbered 1 through 4, starting on the bottom left corner and moving clockwise, what does each number represent?
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1= the atomic #, 2= atomic mass (the atomic mass is the number of protons plus the number of neutrons), 3=charge (+ or -), and 4=the number of atoms in a molecule.
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How do electrons exist?
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In energy states called shells.
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What is a neutral charge in an atom?
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The p+=e-
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Unless written otherwise, the charge of an atom is always _____
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Neutral
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How many electrons are in the first shell of an atom?
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2
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How many electrons are in every shell of an atom other than the first shell?
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8
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