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18 Cards in this Set
- Front
- Back
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Proton |
Identity Positive + 1 amu Nucleus |
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Electron |
Negative - Electron Cloud .00006 amu |
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Neutron |
Neutral 0 1 amu Nucleus |
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Atomic Mass |
All of the mass is found in the nucleus. The mass is made up of the protons plus the neutrons. P + N = Atomic Mass |
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Atomic Number |
Number of Protons |
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Valence Electrons |
*Number of Electrons in the outermost shell *determines reactivity |
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Groups |
Groups are vertical (up and down) everything in the same group has similar reactivity |
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Periods |
Periods are horizontal (left and right) everything in the same period has the same number of rings/energy levels |
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Metals |
All of the elements to the left of the dark stair-step line (except Hydrogen) are Metals. Metals are conductors, ductile (can be pulled into wire), malleable (can be bent), has luster (shiny) |
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Non-Metals |
All of the elements to the right of the dark stair-step line, PLUS hydrogen, are Non-Metals. Non-Metals are poor conductors, dull (not shiny), and brittle (breakable). |
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Most reactive groups |
Groups 1 and 17 |
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Noble Gases |
Group 18 They are completely full, and don't combine with any other element |
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Halogens |
Group 17 Very violent group of elements |
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Organic Elements |
CHOPNS Carbon, Hydrogen, Oxygen, Phosphorus, Nitrogen, Sulfur |
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Charge of the nucleus? |
Always positive! |
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Subscript |
number of atoms for each element example: H2O there are two atoms of hydrogen and one atom of Oxygen |
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Evidence of a chemical reaction |
A NEW SUBSTANCE HAS TO BE FORMED! precipitate - solid formed endothermic/exothermic - temperature change color change smell bubbles - gas formation oxidation - rust combustion - explosion |
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law of conservation of mass |
mass is neither created or destroyed total mass of reactants = total mass of products |
