OB: Transitional Metals become ions too. The rules for ionic bonding and naming ionic compounds from the middle of the table.

You must have a reference table out now, open to the periodic

table.

Let’s look quickly at these basic groupings of metals and non metals:

Group 1 all make only +1 cations, because all have 1 electron in the outer orbital

Group 2 all make +2 cations, because they all lose 2 electrons from their outer orbital

Al makes a +3 cation, because it would lose 3 electrons when it forms a cation

Group 17 all make -1 anions, because all need to gain 1 electron to become isoelectric to the noble gases.

Group 16 all make -2 anions, they need to gain 2 electrons to fill their outer orbital

Group 15 atoms become -3 anions (you probably know why)

We are about to start discussing what we do with those selected oxidation states.

These numbers will be important for a variety of reasons. With the transitional metals, the selected oxidations indicate the charge of the cation that they form.

Scandium makes a +3 cation. See that +3 in the corner? That’s what it’s for.

Yttrium too, a +3 cation. Peek at zinc, it only makes a +2 cation.

The transitional metals make the cations that are indicated, they do not always follow an “isoelectric” rule, like metals we’ve seen in groups 1 and 2 and Al.

When the transitional metals form cations and bond to anions they make ionic compounds. Naming these compounds works the same way as the ones you have already met. For example:

React these atoms by changing them to ions, write formulas and names…

Sc + Cl Sc+3 + Cl-1 ScCl3That stuff is called scandium chloride. Try these 2:

Zr + P

In + F

That stuff is zirconium phosphide

Zr + P Zr+4 + P-3 Zr3P4

In + F In+3 + F-1 InF3

This is indium fluoride

47.88 +2 +3 +4

222-8-10-2

TiTitanium has 3 different positive selected oxidation states. What is possible here?

Turns out that many of the transitional metals, titanium included, can make more than one stable cation.

Titanium can be Ti+2, Ti+3, or Ti+4

How cool is that?

Let’s look at each of these atoms and list what cations that they make:

V-23 for example: V+2, V+3, V+4, and V+5

Cr-24

Fe-26

Cu-29

Ga-31

Cd-48

Nb-41

Hg-80

Let’s look at each of these atoms and determine what cations that they make:

V-23 V+2, V+3, V+4, and V+5

Cr-24 Cr+2, Cr+3, and Cr+6

Fe-26 Fe+2 and Fe+3

Cu-29 Cu+1 and Cu+2

Ga-31 Ga+3

Cd-48 Cd+2

Nb-41 Nb+3 and Nb+5

Hg-80 Hg+1 and Hg+2

They make the cations that they do, the reason is that some of these atoms can flex and become stable

cations even if the electrons are not

isoelectric to a noble gas.

They just can. Just Look.

Let’s make some ionic compounds now.

Combine gold with chlorine (do both cations, one at a time) Write the formulas

Au + Cl Au+1 + Cl-1

__________

Au + Cl Au+3 + Cl-1 __________

The formulas are not too tough, but what will we call these compounds? They can’t have the same name if they’re different!

Let’s make some ionic compounds now.

Combine gold with chlorine (do both cations, one at a time)

Au + Cl Au+1 + Cl-1 AuCl gold (I) chloride

Au + Cl Au+3 + Cl-1 AuCl3 gold (III) chloride

It’s going to take some Roman Numerals to have these names different. The Roman Numeral matches the cation charge. These are called stock names.

Combine every type of manganese cation with bromine. Write formulas and stock names for each one. (fill in ion charges)

Mn + Br

Mn + Br

Mn + Br

Mn + Br

Combine every type of manganese cation with bromine. Write formulas and stock names for each

one. (fill in ion charges)

Mn+2 + Br-1 MnBr2 manganese (II)

bromide

Mn+3 + Br-1 MnBr3 manganese (III)

bromide

Mn+4 + Br-1 MnBr4 manganese (IV)

bromide

Mn+7 + Br-1 MnBr7 manganese (VII)

bromide

There are 2 kinds of copper oxide, we saw them both in the chemical and physical changes lab. One was a black powder, one was red. Show the two ways copper and oxygen can combine ionically, write the proper formulas with their stock names.

Cu + O

Cu + O

There are 2 kinds of copper oxide, we saw them both in the chemical and physical changes lab. One was a black powder, one was red. Show the two ways copper and oxygen can combine ionically, write the proper formulas with their stock names.

Cu+1 + O-2 Cu2O

Cu+2 + O-2 CuO

Copper (I) oxide

Copper (II) oxide

Do Not Forget: the roman numeral matches the cation charge!

Last one…

Combine

tantalum (Ta-73) + sulfur (S-16)

Ta + S

Last one…

Combine

tantalum (Ta-73) + sulfur (S-16)

Ta+5 + S-2 Ta2S5 tantalum sulfide

No roman numeral needed, because tantalum only makes one cation (like with sodium, we don’t eat any sodium (I) chloride, do we?)

At this point, you should be finished up with the monoatomic ions handout.

You should check your grades, make up back work.

Electrons Lab is due by Friday.

Next Tuesday (in six days) we’ll be celebrating this, so,

Read the Naming Compounds Diary, do the 4 drills.

Let’s do some drills now.