Chemistry Matter and Change – Glencoe – Chapter 7

octet rule
atoms tend to gain, lose, or share electrons in order to acquire eight valence electrons

chemical bond
the force that holds two atoms together

cation
postively charged ion

anion
negatively charged ion

compound
a chemical combination of two or more different elements

ionic bond
the electrostatic force that holds oppositely charged particles together in an ionic compound

ionic compound
compounds that contain ionic bonds

crystal lattice
three dimensional geometric arrangement

electrolyte
an ionic compound whose aqueous solution conducts an electric current

lattice energy
the energy required to separate 1 mol of the ions of an ionic compound

nonmetal
an element thta is generally a gas or a dull, brittle solid and is a poor conductor of heat and electricity

formula unit
the chemical formula for an ionic compound which represent the simplest ratio of the ions involved

monatomic ion
a one-atom ion, such as Mg^2 or Br^-

polyatomic ion
ions made up of more than one atom

oxyanion
polyatomic ion composed of an element, usually a nonmetal, bonded to one or more oxygen atoms

physical property
a characteristic of matter tht can be observed or measured without altering the sample’s composition

electron sea model
proposes that all the metal atoms in a metallic solid contribute their valence electrons to form a “sea” of electrons

delocalized electron
electrons present in the outer energy levels of the bonding metallic atoms are not held by any specific atom and can move easily from one atom to the next

metallic bond
the attraction of a metallic cation for delocalized electrons

alloy
mixture of elements that has metallic properties

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