Ionic Compounds

What do these have in common?CO2 H2O C3H8

HCl C6H12O6 MgCl

K2O

• They are all compounds –

2 or more elements

chemically bound together

Ionic Compounds• Ionic compounds are compounds that

consist of a positive ion and a

negative ion that are attracted to

one another because of their

opposite electrical charges.

What are ions?

• An atom or group of atoms that has

gained or lost electrons and has a

negative or positive charge as a

result.

Positively charged ions (cations)• Ca2+ Na+ K+ Mg2+

Al3+ Sr2+

The first one is a calcium ion. What

are the other ones called?

• Sodium

• Potassium

• Magnesium

• Aluminum

• Strontium

Negatively charged ions (anions) Cl- F- O2- P3- S2-

N3-

The first one is a chloride ion. What

are the other ones called?

• Fluoride

• Oxide

• Phosphide

• Sulfide

• Nitride

What happens when two oppositely charged ions come together?

Na+ + Cl-

?

They form an ionic compound that has a neutral charge!

NaCl

Quick Task

• Take all 6 positively charged ions

from this presentation and combine

them with the 6 negatively charged

ions from the this presentation and

write their names and formulas

Names are easy – positive ions first and negative ions last

Sodium chloride

A bunch of names

Calcium chlorideCalcium fluorideCalcium oxideCalcium phosphideCalcium sulfideCalcium nitride

Sodium chlorideSodium fluorideSodium oxideSodium phosphideSodium sulfideSodium nitride

Potassium chloridePotassium fluoridePotassium oxidePotassium phosphidePotassium sulfidePotassium nitride

Magnesium chlorideMagnesium fluorideMagnesium oxideMagnesium phosphideMagnesium sulfideMagnesium nitride

Aluminum chlorideAluminum fluorideAluminum oxideAluminum phosphideAluminum sulfideAluminum nitride

Strontium chlorideStrontium fluorideStrontium oxideStrontium phosphideStrontium sulfideStrontium nitride

Formulas? Remember they have to be neutral after they combine

Ca2+ + Cl- ?

Ca2+ combines with2 Cl- to give: CaCl2The 2 chlorides add upto -2, cancelling out the+2 charge of the calcium

A bunch of formulas

CaCl2CaF2CaOCa3P2CaSCa3N2

NaClNaFNa2ONa3PNa2SNa3N

KClKFK2OK3PK2SK3N

MgCl2MgF2MgOMg3P2MgSMg3N2

AlCl3AlF3Al2O3AlPAl2S3AlN

SrCl2SrF2SrOSr3P2SrSSr3N2