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