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16 Cards in this Set
- Front
- Back
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Law of Conservation of Mass |
Matter cannot be created or destroyed in a isolated system |
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Law of Definite Proportions |
the proportion of elements in an compound is always the same |
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Law of Multiple Proportions |
If two elements combine to form different compounds, the ratio of masses of the second element that react with a fixed mass of the first element will be simple whole- number ratio |
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Dalton's Atomic Theory |
1. Each element is composed of atoms 2. All atoms of the same element are identical 3. Atoms cannot be changed, created, or destroyed 4. A compound is formed when two or more different elements combine |
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Protons |
subatomic particles that has a positive charge and that is found in the nucleus of an atom |
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Electrons |
a subatomic particle that has a negative charge |
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Neutron |
a subatomic particle that has no charge and that is found in the nucleus |
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Atomic Number |
The number of protons |
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Mass Number |
Protons and neutrons; whole number |
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Ions |
Charged atoms or groups of atoms |
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Anions |
When atoms gain electrons, they become negatively charged ions |
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Cation |
When atoms lose electrons, they become positively charged |
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Periodic Law |
When the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically |
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Metals |
Solid at room temperature, except Hg conduct heat and electricity malleable ductile |
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Non- Metals |
Found in all three states Poor conductors of electricity Solids are brittle Sulfur, Bromine, Chlorine |
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Metalloids |
Show some properties of metals and some nonmetals |
