Chemistry Notes

Bonding in Metals

Metallic Bonds

Metallic bonds consist of metal cations with a free-floating “sea of electrons”

This explains many physical properties—why metals are good conductors, and why they are malleable and ductile

Malleablilty/Ductility

Ductile – the ability to be

drawn into wires

Malleable – the ability to be

hammered into shapes

Malleablilty/Ductility

Metals display these characteristics because when subjected to pressure, cations can easily slide past one another (unlike ionic solids, which have very strong attractive and repulsive forces)

Alloys

Most metals you use everyday

are a mixture of two or more

elements, for example brass,

bronze or steel. These are

called alloys.

Alloys

The importance of alloys are

that often they have superior

properties than the elements

they are made of.

Chemistry Notes

Names & Formulas

With Transition Metals

Transition Metals

So far, we have only written names

and formulas using the

representative elements.

Transition metals are different

because they can become stable

with different oxidation numbers.

Ex) Iron can have a +2 or a +3

Transition Metals

Since transition metals can have

more than one charge, it must be

designated in the name.

Naming Ionic Compounds

We do this by putting the charge as a Roman numeral in parenthesis between the positive and negative ion.

Use the reverse criss cross method to determine what goes in parentheses.

Naming Ionic Compounds

Example: FeCl3Iron (III) chloride

Example: FeCl2Iron (II) chloride

Practice Problems

Name the following:

CoCl2Fe2O3

Cu2S

MgCl2HgBr2

Practice Problems

Write the formula for the following: Iron (II) Fluoride

Practice Problems

Write the formula for the following: Mercury (I) Sulfide

Practice Problems

Write the formula for the following: Cobalt (II) Phosphide

Practice Problems

Write the formula for the following: Chromium (II) Nitride