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23 Cards in this Set

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  • Back
atom
The smallest chemical unit of matter.
element
Matter composed of one kind of atom.
Molecule
What atoms form when they are chemically combined.
Compounds
Molecules made up of atoms of 2 or more elements .
Atomic Number
# of protons in an element
Octet rule
When the electron is stable. (Has all 8 electrons in the outer shell)
Ion
A charged atom made when an atom gains/loses one or more electrons.
Cation
A positively charged ion.
Anion
A negatively-charged ion.
Atomic Mass
The sum of the # of protons and neutrons in an atom.
Mole
*AKA Gram Molecular Weight
*The weight of a substance in grams (g) equal to the sum of the atomic weights of the atoms in a molecule of the substance.
Isotopes
Atoms of a particular element that have diff. #'s of neutrons.
Radioisotopes
Radioactive isotopes.
*Radioactive: The nuclei of unstable isotopes that thend to emit subatomic particles and radiation.
Chemical Bonds
Bonds that are fomed between atoms through interactions of electrons in their outer shells.
Ionic Bonds
Result from the attraction between ions that have opposite charges.
*A metal and nonmetal
Covalent Bonds
Formed by the sharing of electrons.
Polar Compound
Unequal sharing of e- between atoms, molecule is called this.
solvent
The medium in which substances re dissolved.
Solute
The substances dissolved in the solvent.
pH
Proton concentrations.
Reactants
The substances that enter the reaction.
Mixture
Consists of 2 or more substances that are combined non-chemically.
Solution
A mixture of 2 or more substances where the molecules are evenly distributed and won't separate out upon standing. (Chemically combined)