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ca2007
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Composed of individual particles that have the same properties.
element
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The basic indivisible particle of which matter is made.
atom
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A measure of the amount of matter in an atom.
mass
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A combination of 2 or more atoms.
molecule
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An atom or molecule with an electrical charge.
ion
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Subatomic particle found in the nucleus, has mass, and a positive charge.
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Subatomic particle found in the nucleus, has mass, and is neutral - no electrical charge.
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Subatomic particles found in spheres hovering around the nucleus; very little mass (basically zero), but a
negative electrical charge
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Region in the middle of an atom, where the mass is centered; composed of protons and neutrons.
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Basic rule on electrons: do they like to be separate, in pairs, or in other groups?
pairs
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Maximum number of electrons in the first energy level, closest to the nucleus.
2
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Maximum number of electrons in the second energy level.
8
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For small atoms, maximum number of electrons in the third energy level.
8
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True or false: the basic rule on electrons is fill the first energy level before putting electrons in the second, and fill the second before putting electrons in the third.
true
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The chemical symbol for the element hydrogen.
H
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The chemical symbol for the element carbon.
C
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The chemical symbol for the element nitrogen.
N
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The chemical symbol for the element oxygen.
O
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The chemical symbol for the element sodium.
Na
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The chemical symbol for the element magnesium.
Mg
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The chemical symbol for the element phosphorus
P
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The chemical symbol for the element potassium.
K
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The chemical symbol for the element calcium.
Ca
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What does the row number in the Periodic Table mean?
number of energy levels (shells) occupied by electrons
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What does the column number in the Periodic Table mean?
number of electrons in the valence shell
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What's so special about the elements in column VIII?
Their valence shells are filled.
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