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18 Cards in this Set
- Front
- Back
- 3rd side (hint)
Atom
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Smallest particle of an element
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A water molecule has 3 atoms
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Atomic mass
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Average mass of atoms in an element
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The atomic mass of Lithium is 6.941
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Atomic Mass Unit
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1/12 the mass of the mass of C12
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The atomic mass is described by the atomic mass unit.
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Atomic Number
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Number of protons in the nucleus of an atom
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The atomic number of Lithium is 3
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Atomic Symbol
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Tells mass number and number of protons
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The atomic symbol of Carbon tells that the atomic mass is 12amu and there are 6 protons in every atom.
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Chemical Symbol
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1-3 letters representing an element
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The chemical symbol for sodium is Na.
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Electron
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Particle of an atom with a negative charge
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Carbon has 6 electrons.
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Group
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Elements of a vertical column in the periodic table
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The noble gases are a group
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Isotope
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One of two or more atoms having the same number of protons but different numbers of neutrons
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Hydrogen has 3 isotopes
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Mass Number
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Total number of protons and neutrons in an atom
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The mass number of carbon is 12
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Metal
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any of a class of elementary substances that are crystalline when solid and are characterized by opacity, ductility, conductivity, and a unique luster
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Copper and gold are metals.
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Metalloid
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an element whose properties are intermediate between those of metals and solid nonmetals
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Germanium is a metalloid.
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Neutron
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Subatomic particle without an electric charge
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Neutrons are in the nucleus.
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Nonmetal
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Substance without the same characteristics as a metal.
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Nitrogen is a nonmetal.
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Nucleus
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Center of the cell containing protons and neutrons. Makes up most the the cell's mass.
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A nucleus has protons and neutrons.
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Period
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Name of a horizontal row on the periodic table.
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Period 1 contains hydrogen and helium.
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Proton
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Positively charged subatomic particle located in the nucleus.
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Protons are in the nucleus with neutrons.
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Subatomic Particle
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a particle smaller than an atom
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Protons and neutrons are subatomic particles
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