IONIC COMPOUNDS
Ionic compounds
- compounds where ions are bonded together by electrical charge
- tend to have very high melting points
- are electrically neutral
-have positively charged ions called cations and negatively charged ions called anions
- form crystals
Writing Formulas for Ionic Compounds
To write formulas for ionic compounds, determine the cation and the anion.
All elements that are metals will keep their name. Elements that are non metal will change their ending to ide. For example, To write the formula for potassium chloride, always write write the cation first and then the anion. Then you need to figure out potassium's and chloride's charge. Potassium's charge is +1 and chloride's charge is -1. The next thing you need to do is cross the charges. When you cross the charges they cancel each other out. So your formula should be KCl.
When an ionic compound has a transition metal such as iron, zinc, or lead, you need Roman numerals. Here's an example on how to write a formula with Roman numerals.
Write the name for Fe2O3.
Since the charges are crossed, iron has a charge of +3 and oxygen has a charge of -2. Iron is a transition metal you write out the Roman numeral. So the name of the formula is written as iron(iii) oxide.
Write the formula for
- compounds where ions are bonded together by electrical charge
- tend to have very high melting points
- are electrically neutral
-have positively charged ions called cations and negatively charged ions called anions
- form crystals
Writing Formulas for Ionic Compounds
To write formulas for ionic compounds, determine the cation and the anion.
All elements that are metals will keep their name. Elements that are non metal will change their ending to ide. For example, To write the formula for potassium chloride, always write write the cation first and then the anion. Then you need to figure out potassium's and chloride's charge. Potassium's charge is +1 and chloride's charge is -1. The next thing you need to do is cross the charges. When you cross the charges they cancel each other out. So your formula should be KCl.
When an ionic compound has a transition metal such as iron, zinc, or lead, you need Roman numerals. Here's an example on how to write a formula with Roman numerals.
Write the name for Fe2O3.
Since the charges are crossed, iron has a charge of +3 and oxygen has a charge of -2. Iron is a transition metal you write out the Roman numeral. So the name of the formula is written as iron(iii) oxide.
Write the formula for