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23 Cards in this Set
- Front
- Back
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Lavoisier |
Law of Conservation of Mass Law of Definite Composition |
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Dalton |
Atomic Theory |
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Bohr |
Bohrs atomic model. |
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Mendeleev |
Created the periodic table. |
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Conservation of MLaass |
In a chemical change, the mass will stay the same before and after. |
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Law of Definite Composition |
Compounds are pure substances that contain two or more types of atoms. |
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Elementa |
A pure substance with 1 atom type. |
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Compounds |
Pure substances with two or more atoms. |
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Protons |
Tiny positive particles found inside the nucleus. |
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Electrons |
Negative particle found in the shells that are 1835 times smaller. |
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Metals |
Solid (Mercury) Shiny Conduct heat and electricity Malleable and Ductile |
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Non-Metals |
Gas and Solids (Bromine) Dull Poor conductors Brittle not Ductile |
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Metalloids |
Solid Shiny and dull Conduct electricity not heat Brittle not ductile |
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Alkali Metals |
Group 1 Very reactive 1 electron in outer level Require special storage |
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Alkaline Earth Metals |
Group 2 Somewhat reactive 2 electrons in outer level |
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Halogens |
Group 17 Extremely reactive 17 electrons in outer level Used as disinfectants
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Noble gases |
Group 18 Un-reactive 18 electrons in outer level
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The staircase |
Divides the metals and non metals |
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What should be on a block |
Element name Atomic # Symbol Mass |
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Atomic number |
How many protons and electrons |
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Atomic Mass |
The average mass of an atom in an element. |
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P.E.N. |
Protons= Electrons = atomic # |
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How to get neutrons |
Mass- number |
