Atoms/ groups of atoms with an electrical

charge

Positive Ions

Loses

electrons

Negative Ions

Gains

electrons

MEMORIZE the names and charges of common ions – p 19

Prefix Meaning

Mono-

Di-

Tri-

Tetra-

Penta-

One

Two

Three

Four

Five

Metal and Non-metal:Metal + Non-metal + “-ide”

Non-metal and Non-metal:• Name first non-metal, then

second non-metal and add “–ide”• Use prefixes for ratio’s of

elements

Elements to the left of periodic table are named FIRST!!!

Name cation first, then anion If the cation is a transition metal:

• Ion has more than one possible charge

• Use Stock-notation to indicate charge (Roman numerals after name)

Name the following compounds:a) CaBr2

b) N2S5

c) V2O5 (V5+)

d) ZnSO4

e) (NH4)3PO4

f) Na3P

Na2CO3

Two Sodium Ions

SodiumCarbon

Oxygen

Three Oxygen Atoms

Group I = +1 Group II = +2 Group III = +3 Group IV = + 4

Group V = -3 Group VI = -2 Group VII = -1 Group VIII = Do Not

form BONDS!!!

Transitionmetals• Indicated by Stock-notation• Know general charges – p19

Poly-atomic ions• Know charges – p 19

Substances combine in such a way that the compound is neutral• Sum of charges = 0

Choose ion with largest charge• Assume there are only one atom of that

ion in the compound Set number of atoms of other ion = x

• Solve for x Remove fractions to obtain whole numbers

Write chemical formulae for compounds of the following substances:

a) Sodium and oxygen b) Potassium sulphide c) Iron(II)chlorided) Magnesium carbonatee) Calcium Nitratef) Aluminium oxideg) Ammonium sulphate