a positively charged ion
a negatively charged ion
swap and drop
a shortcut for determining the ionic compound's formula: Al+3 and O-2 make Al2O3
exceptions to swap and drop
sometimes the ratio can be reduced. Ca+2 and O-2 don't make Ca2O2; they make CaO
1:1 is a simper ratio than 2:2
because of the d orbitals, transition metals can have more than one charge.
You need to use a Roman numeral in the name to signify the charge.
Ex: iron III oxide
naming ionic compounds
cation name stays the same
anion gets "-ide"
transition metals get a Roman numeral
Ex: mercury II sulfide
a group of atoms covalently bonded together which together carry a charge.
Two atoms must have an electronegativity difference of 2 or higher to be considered an ionic compound.
periodic chart trend
ionic compounds are always a metal and a nonmetal
the elements come from opposite sides of the periodic chart
An alkali earth metal and a halogen will form an ionic compound. What will be the ratio of the elements?
Elements from group 1 and group 6 form an ionic compound. What will be the ratio of the elements?
properties of ionic compounds
crystaline, brittle, high melting point, soluble in water
Good conductors of electricity when dissolved in water