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작성자삐돌이 조회 22회 작성일 2021-01-18 07:17:24 댓글 0


How to Write the Name for Fe2O3

In this video we'll write the correct name for Fe2O3. To write the name for Fe2O3 we’ll use the Periodic Table and follow some simple rules.

Because Fe2O3 has a transition metal we need to indicate the ionic charge using Roman numerals in parenthesis for the transition metal.

---Keys for Naming Compounds with Transition Metals---

1) Write the name of transition metal as it appears on the Periodic Table.

2) Write the name and charge for the non-metal. If you have a polyatomic ion, use the Common Ion Table to find and write the formula and charge.

3) Use the total charge on the non-metal (or polyatomic ion) find the charge on the transition metal.

4) After the name for the metal, write its charge as a Roman Numeral in parentheses. Example: Iron (III) chloride

For a complete tutorial on naming and formula writing for compounds, like Iron (III) oxide and more, visit:


Writing the name for Fe2O3 is a bit more challenging since Fe is a transition metal. This means you need to use parenthesis and Roman Numerals to show the charge on the Fe atoms.

In this case each Fe atom has a charge of +3 so we write Fe2O3 as Iron (III) Oxide.

Balance: Fe + O2 = Fe2O3

In order to balance Fe + O2 = Fe2O3 you'll need to watch out for two things.

First, be sure to count all of Fe and O atoms on each side of the chemical equation. Once you know how many of each type of atom you have you can only change the coefficients (the numbers in front of atoms or compounds) in order to balance the equation.

Second, when you balance the equation it is easier to change the coefficient in front of Fe2O3 first in order to get an even number of Oxygen atoms. As a general rule, this makes balancing equations much easier.

Drawing/writing done in Adobe Illustrator 6.0. Screen capture done with Camtasia Studio 4.0. Done on a Microsoft Surface Pro 3.

Is Fe2O3, Iron (III) oxide. Ionic or Covalent?

To tell if Fe2O3 (Iron (III) oxide) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that Fe is a metal and O is a non-metal. When we have a metal and a non-metal the compound is usually considered ionic.

Because we have a metal and non-metal in Fe2O3 there will be a difference in electronegativity between the metal and non-metal. This difference results in an electron(s) being transferred from the metal (lower electronegativity) to the non-metal (higher electronegativity). The results in the metal becoming a positive ion and the non-metal a negative ion. The two opposite charges are attracted and form the ionic bond between atoms in Iron (III) oxide.
Helpful Resources

Metals, Non-Metals on the P- Table:

Ionic, Covalent, \u0026 Polar Covalent:

Electronegativity for each element: https://en.wikipedia.org/wiki/Electronegativity
Because we have a combination of a metal and non-metal Fe2O3 (Iron (III) oxide) is considered an ionic compound.

In general, ionic compounds:

- form crystals.
- have high melting points and boiling points.
- are hard and brittle.
- conduct electricity when dissolved in water.
- as solids do not conduct electricity.

For more chemistry help, see http://www.Breslyn.org.




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