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20 Cards in this Set
- Front
- Back
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the center of an atom
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nucleus
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a substance made up of only one kind of atom
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element
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a subatomic particle with a negative charge
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electron
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the smallest unit of an element that has all the properties of that element
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atom
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the elements are arranged in order of atomic number
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periodic table
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a substance made of atoms of two or more elements
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compound
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a subatomic particle with a positive charge.
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proton
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A group of two or more atoms joined together
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molecule
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a subatomic particle with no charge
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neutron
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scientists who studied atoms
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Bohr & Dalton
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properties of metals
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ductile, malleable, heat conductor, electrical conductor
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subatomic particles
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proton, neutron, electron
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common elements
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iron, silicon, oxygen, sodium
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The order of the elements in the periodic table is based on the ....
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number of protons in one atom.
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Elements with properties of metals & nonmetals are called...
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metalloids
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A Russian chemist named Dmitri Mendeleev organized elements by ....
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atomic mass.
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Theories in science are...
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based on experimental evidence.
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The atomic theory states that matter is made up or...
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atoms
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If an element has gray luster and can be drawn into a wire, it is probably a...
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metal
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What elements does the compound MgCl2, magnesium chloride, contain?
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magnesium and chlorine
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