## (5) Element Formulas

### Obj. 5. From the name of an *element*, determine the
formula (if different from the symbol).

The only **elements** for which we have to deal with the formula being
different from the symbol are the **diatomic elements**. The diatomic
elements are hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine. Remember,
these nonmetals are found across the top of the periodic table, plus the halogens. (You
could also remember S_{8} and P_{4} and other elements in their families,
but the formulas of their molecules can change with conditions, and they are usually
represented by their symbols rather than their formulas.) With that information, try your
hand at exercise 5.

### Exercises

Give the formula for each of the following elements if it is different than the symbol
for the element.

a. hydrogen

b. sodium

c. silicon

d. nitrogen

e. oxygen

f. fluorine

g. neon

### Answers to Exercises

Give the formula for each of the following elements if it is different than the symbol
for the element.

a. hydrogen - The formula is H_{2}.

b. sodium - Sodium does not have a different formula, so we just use the symbol Na.

c. silicon - For silicon, we use the symbol Si.

d. nitrogen - Nitrogen has the formula N_{2}.

e. oxygen - Oxygen has the formula O_{2}.

f. fluorine - Fluorine has the formula F_{2}.

g. neon - For neon we use the symbol Ne.

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