Chemical Change

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1.
Alchemist
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Element
3.
Scientist
4.
Observation
5.
Investigation
6.
Substance
7.
Metal
8.
Gold
9.
Mercury
10.
Sodium
11.
Potassium
12.
Physical
13.
Chemical
14.
Matter
15.
Property
16.
Flammability
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Reactivity
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Toxicity
19.
Atom
20.
Proton
21.
Neutron
22.
Electron
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Nucleus
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Symbol
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Periodic
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Malleable
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Ductile
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Metalloid
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Compound
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Mixture