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32 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Element
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basic building blocks of matter
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Atom
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smallest unit of an element, still having the properties of that element
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Compound
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a substance made up of 2 or more elements
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Molecule
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smallest unit of a compound
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subatomic particles
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electron (-), proton (+), neutron (0), make up atoms
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atomic number
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number of protons
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Atomic Mass
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number of protons + number of neutrons
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Nucleus
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contains protons and neutrons
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Isotope
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a version of an element with a different number of neutrons
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Valence electrons
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electrons in outer shell
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Noble gases (group VIIIA)
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outer-most shells are completely filled (2 or 8 e-) and so are very stable
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Why are there decimals in atomic mass?
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The periodic table lists weighted average atomic mass of all isotopes of that element
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Rows
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"periods"
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Columns
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"groups" or "families"
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Period number
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Identifies outermost shell number
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Diatomic molecules
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Elements that usually are found in pairs
(H2, N2, O2, F2, Cl2, Br2, I2) |
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electronegativity
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The measure of the afinity for electrons
-F is the most electronegative element -electronegativity decreases as you move down the periodic table |
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Ionization Energy
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the energy required to pull away an electron
-ionization energy increases as you move down (to the right) the periodic table |
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Atomic Radius
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distance from the necleus to the outermost electrons
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ur cute
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Stoichiometry
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Math in chemistry
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Think of balancing equationsur cture i hate bkm
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empirical formula
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the smallest whole number ratio of elements in a compound
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ilana sucks
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Chemical formula
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The actual formula of the compound
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Atomic Mass
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1. The number of protons + neutrons
2. The mass of the element in grams per mole 3. The mass of 1 atom of the element in atomic mass units |
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mole
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a number - 6.02 x 10^23
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A UGLY ANImal
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Anions
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Negatively charged ions
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Cation
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positively charged ion
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+
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1. Intermolecular bonds
2. Intramolecular bonds |
1. Bonds between molecules that are caused from positive and negative charge. (weaker than intra. bonds)
2. Bonds between elements that are caused from sharing electrons. (stronger than inter. bonds) |
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Hydrogen bond
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formed between 2 molecules that have a H and a (F or O or N)
[intermoleculer bond) |
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Covalent Bond
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Formed when 2 atoms share valence electrons
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brianne killed bay
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Ionic Bond
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formed when 2 ions of opposite charge come together
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kill ilana
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Non-polar Molecule
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any partial charges are cancelled out
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'Polar' molecule
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has side with opposite partial charges
-only a polar molecule if polar bonds dont cancel |
hi :)
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