Scientific Tutor
Chem – Naming Ionic Compounds Part 2
Author: Andrew
What sections should I know before attempting to learn this section?
—> Covalent, Ionic, and Metallic Bonds
—> Breaking Apart Ionic Compounds
How do you use an ionic name to create the ionic compound?
Going in the other direction (taking the name and making the ionic compound), however, is a littler harder. First, you have to find the charges of the elements, and then you have to get them to total up to zero. How many of each element you need depends on how many each take to get to zero. In math, they call this concept the least common multiple.
Examples: Give the ionic compound from the name using a regular periodic table. Don’t forget to use the ion periodic table if you need it. VIDEO Ionic Naming Examples 2.
| Lithium Phosphide | Li3P |
| Radium Iodide | RaI2 |
VIDEO Ionic Naming Demonstrated Example 2: Give the ionic compound from the name using a regular periodic table. Don’t forget to use the ion periodic table if you need it.
Sodium Chloride
Step 1:
What is the symbol for Chloride?
Answer: Cl
| Cl | ||
| 1 | ||
| 1 | ||
| Total = |
Step 2:
What is the ion of Chloride?
Answer: -1
| Cl– | ||
| 1 | ||
| 1 | ||
| Total = |
Step 3:
What is the symbol for Sodium?
Answer: Na
| Na | Cl– | |
| 1 | ||
| 1 | ||
| Total = |
Step 4:
What is the ion of Sodium?
Answer: +1
| Na+ | Cl– | |
| 1 | ||
| 1 | ||
| Total = |
Step 5:
What is the least common denominator between 1 and 1?
Answer: 1
| Na+ | Cl– | |
| 1 | ||
| 1 | ||
| Total = | +1 | -1 |
Step 6:
What is the complete chemical formula?
COMPLETE ANSWER: NaCl
VIDEO Ionic Naming Demonstrated Example 3: Give the ionic compound from the name using a regular periodic table. Don’t forget to use the ion periodic table if you need it.
Calcium Phosphide
Step 1:
What is the symbol for phosphorous?
Answer: P
| P | ||
| 1 | ||
| 1 | ||
| Total = |
Step 2:
What is the charge for phosphorous?
Answer: -3
| P3- | ||
| 1 | ||
| 1 | ||
| Total = |
Step 3:
What is the symbol for calcium?
Answer: Ca
| Ca | P3- | |
| 1 | ||
| 1 | ||
| Total = |
Step 4:
What is the charge for calcium?
Answer: +2
| Ca2+ | P3- | |
| 1 | ||
| 1 | ||
| Total = |
Step 5:
What is the least common denominator between 2 and 3?
Answer: 6
| Ca2+ | P3- | |
| 1 | ||
| 1 | ||
| Total = | +6 | -6 |
Step 6:
How many phosphorous do you need to add up to a total of -6?
Answer: You need 2 phosphorus
| Ca2+ | P3- | |
| 1 | P3- | |
| 1 | ||
| Total = | +6 | -6 |
Step 7:
How many calcium do you need to add up to a total of +6?
Answer: You need 3 Ca
| Ca2+ | P3- | |
| Ca2+ | P3- | |
| Ca2+ | ||
| Total = | +6 | -6 |
Step 8:
What is the complete chemical formula?
COMPLETE ANSWER: Ca3P2
PRACTICE PROBLEMS: Give the ionic compound from the name using a regular periodic table. Don’t forget to use the ion periodic table if you need it.
| Lithium Chloride | LiCl |
| Calcium Iodide | CaI2 |
| Beryllium Oxide | BeO |
| Strontium Phosphide | St3P2 |
| Potassium Silicide | K4Si |
| Sodium Sulfide | Na2S |
Posted in Chemistry
