unit 4 terms

ion

an atom with a charge

canion

ion with a positive charge

anion

ion with a negative charge

isoelectric

atoms want to have the same electron configuration as their nearest noble gas.

isoelectric metals

lose electrons (becoming positive ions)

isoelectric nonmetals

gain electrons (becoming negative ions)

monatomic ions

ions formed from a single atom

binary Ionic compounds

compounds composed of two different elements

covalent bonding

valence electrons are shared between atoms

one covalent bond

2 e-’s between 2 atoms

two covalent bonds

4 e’s between 2 atoms

polyatomic ions

2 or more covalently bonded atoms that, when bonded, form a complex ion

oxyanions

polyatomic ions that contain oxygen

crystal lattice

how ions are packed together to form a crystal

unit cell

the smallest repeating unit in a crystal lattice

ionic compounds

solid at room temp., hard, brittle, high melting and boiling points, low conductivity

why ionic compounds have high melting points

extreme energy is needed to free neighboring ions from their locked positions