~ as was mentioned earlier, when two or more elements come together chemically, you get a compound....

~ As was mentioned earlier, when two or more elements come together chemically, you get a compound. But, there are often numbers attached to different elements that mean specific things….scarrry things…

CHEMICALFORMULAS

WATER

H2O

HYDROGEN OXYGENTHIS SUBSCRIPT 2

MEANS THERE ARE

TWO (2) ATOMS OF

HYDROGEN IN WATER

Whenever you see a subscript number to the right of an element or atom, it means

There are that many atoms in the compound. BUT when no number is present, it

Is assumed that the number of atoms in the compound is just one (1)

Thus, in water there are 2 Hydrogen atoms and only

1 Oxygen

H2O• Here is what it looks like:

O

H

H

Try Some…

NaCl (table salt)

How many of each in table salt?

Na (sodium) =

Cl (chlorine) =

1

1

Na Cl

HClHydrochloric Acid

H (Hydrogen) =

Cl (Chlorine) =

1

1

How many

elements are

present in this

compound?

(Add the total in the

Formula)

2

C6H12O6(Sugar)

C (Carbon) =

H (Hydrogen) =

O (Oxygen) =

6

12

6 Total = 24

Be3Al2SiO6Emerald

• Write this formula down on your paper, identify the elements, how many of each, and the total number –

Beryllium (3), Aluminum (2), Silicon (1), Oxygen (6)Total = (12)

Chemical Name Formulas

Element 1 Element 2 Totals

1 potassium fluoride

KF

2 calcium chloride

CaCl2

3 barium bromide BaBr2

4 silver sulfide

Ag2S

5 aluminum iodide

AlI3

6 potassium iodide

KI