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Two or more atoms may combine to form molecule
- Short hand used to depict the numbers and types of atoms in a molecule Molecular Formula
- Representation of the way atoms bond in a molecule Structural formula
- the space occupied by an electron circling the nucleus at a particular energy level Electron Shell
- except the first shell, it takes 8 electrons to fill the outer shell octet rule
- connection between atoms in a compound bond
- nonreactive with other elements inert
- an electron located in the outer shell of the atom, that can be transferred to or shared with another atom valance electron
- outer most shell is completely filled with electron and is inactive is what type of atom inert atom
- atoms that gain or lose electrons become electrically charged and are called ions
- positively charged ions are called cations
- negatively charged ions are called anions
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ions with opposite charges attract forming ionic bonds
- a chemical bond between atoms that share electrons is a covalent bond
- electrons and protons are not distributed symmetrically polar
- three types of chemical bonds: hydrogen bond, covalent bond, ionic bond
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the STARTING materials changed by the chemical reaction reactants
- the atoms, ions, or molecules formed AFTER the reaction products
- Building large molecules by bonding smaller ones synthesis Rx
- if the bonds of a reactant molecule break apart to form simpler forms its called decomposition Rx
- parts of two different types of molecules trade positions as bonds are broken exchange Rx
- the product or products can change back to the reactant or reactants reversible Rx
- molecules that influence the rates of chemical reactions but are not consumed catalyst
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