NAME:_________________________________
Mods:__________
Now it is time to start looking at the compounds the elements form when they come
together! First, we’ll focus on proper formula writing and naming of these compounds (so we can
speak the language!), then we’ll move on to understanding how they are put together (bonding!).
So, let’s get started!
1.
First off, recall that all atoms are electrically neutral. WHY is that?
2.
So, what exactly is an ion? How are they formed? WHY are they formed?


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3.
Remember we have cations which are _____________________, and anions which
are _____________________. Which type of elements form which type of ions?
 Cations –
 Anions –
4.
This is how we name these single-atom ions: Anionic element names end in –ide, while
cationic element names stay the same. Both, of course, will include the word ION!
Na+1 = Sodium Ion
O-2 = Oxide ion
Ca+2 = _______________________
Cl-1 = ________________________
Al+3 = _______________________
S-2 = ________________________
Mg+2 = _______________________
Br -1= ________________________
*Complete –IDE table on the back of the Notes Packet!
5.
So, where do these charges come from? Remember, STABILITY is the key! All atoms will
become ions in an effort to become more stable: they want to have a lower
_____________________________ ____________________. Some ionize in a very
predictable fashion (like the _________________________________________________),
while others are not as predictable (like the _____________________________________).
And others don’t form ions at all (like the _______________________________________)!
*Refer to your tables of ions to find out what charge an atom will become when it ionizes.
Also, note the names of the transition metal ions (I typically use the stock name).
6.
What is a polyatomic ion?
Remember, they form in an effort to be more stable as well (safety in numbers!).
Make sure you memorize the 20 formulas and names of the polyatomic ions I gave
you – it will make your lives easier! Trust me! 
7.
What are ionic compounds? Do they have an electrical charge? WHY or WHY NOT?


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
What happens to sodium’s valence electron when it reacts with chlorine?
Cl-1
Na+1
Ca+2
Fe+3
NH4+1
SO4-2
OH-1
8.
What is a molecule? What are compounds called that are composed of molecules?


9.
A couple elements actually exist in nature as molecules. There are seven (7) of them, and
they exist as diatomic molecules (_____ ______________!). List the 7 here:
10.
What is a chemical formula?
11.
Let’s compare and contrast ionic and molecular compounds:

IONIC
MOLECULAR
Melt / Boil
Exist as at room
temperature
Made from what
type of elements
Formulas
12.
What is an acid?
Hydrochloric Acid
Sulfuric Acid
Carbonic Acid
Nitric Acid
Phosphoric Acid
Acetic Acid
13.
MOLECULAR COMPOUNDS!
So far, we haven’t done much with molecular compound formulas. These compounds are
NOT made of ions, so there are no charges to check to write the formulas. We use prefixes in
their names (see your “Flowchart”, lower left corner) and these prefixes “tell” us how to write the formula!
14.
disulfur hexachloride _______________
trihydrogen pentabromide ______________
*carbon monoxide
tetraphosphorus dinitride ______________
_______________
Why is it necessary to have a systematic method of naming chemical compounds?
Ion Name
Ion Formula
Nitride
Phosphide
Arsenide
Oxide
Sulfide
Selenide
Telluride
Fluoride
Chloride
Bromide
Iodide
Cyanide
Hydroxide
Peroxide
*The beginning of the compounds are SINGLE-ELEMENT cations,
unless you see AMMONIUM or HYDRONIUM!