How to write and name formulas in chemistry

Solution Write the formula for aluminum nitride Write the formula for lithium oxide 1.

Naming chemical formulas

Now as you can imagine with potassium having a positive one charge or one plus charge and this having a negative charge, they're going to be attracted to each other and they can actually form an ionic compound. Ions are of two types, i. Elements ending in -ide, for example, can be found in groups 15 through 17 on the periodic table. It will balance the negative charge of Sulfur which is You might be given a name of a compound, such as sodium chloride, and you must determine which atoms are present. By putting the reactants on left and products on the right in the equation makes a full equation. Things that would really love to grab an electron. This formula indicates that this compound is made up of twice as many sodium ions as sulfide ions. There are two oxygen atoms so we also add the prefix di to get dioxide. They have seven electrons in their outermost shell. There is no prefix before carbon in the chemical name, therefore, there is only 1 C atom in the chemical formula.

By putting the reactants on left and products on the right in the equation makes a full equation. In Greek, Di means two and Penta means 5.

Because the overall compound must be electrically neutral, decide how many of each ion is needed in order for the positive and negative charge to cancel each other out.

So you know the chloride part, you say okay, this is going to be an anion because instead of writing chlorine which is the name of this element, I wrote this IDE at the end to say, "Hey, this is an anion," so I know that this is the chlorine anion, this is chloride, why didn't I do something similar for potassium?

Even though it is a group of atoms it acts like it were a single atom. So this component is made with two atoms of phosphorus and five atoms of oxygen. The anions are called the last names. And so let's look at a situation where I have some potassium that has been ionized.

Naming ionic compounds

Consider a real formula for an example, i. Balancing the Charges Finding the valence of each element is essential when writing, because you need to balance your chemical formula, so it has no charge. Groups 13, 14 and 18 have variable charges, and groups 15 through 17 are anions, meaning they have negative charges. This will balance 2- charge of oxygen and the formula of this compound is Li2O. You might be given a name of a compound, such as sodium chloride, and you must determine which atoms are present. Well, the way the convention works is if someone says potassium chloride, you know you're dealing with an ionic compound and if the chlorine has a negative one charge, an ionic compound, the whole thing is gonna be neutral. Write the final formula. Thus there are 2 N atoms in the chemical formula. In this type compounds, in order to know how many atoms are there, you have to balance the charges of elements. In order to balance the charges, you have equal them for both the elements of a compound by adding the atoms. And this right over here would be described as potassium chloride. This formula merely indicates that sodium chloride is made of an equal number of sodium and chloride ions. Now as you can imagine with potassium having a positive one charge or one plus charge and this having a negative charge, they're going to be attracted to each other and they can actually form an ionic compound. Such cations or anions are called as polyatomic ions.

Updated March 09, By Cara Batema Chemical formulas are shorthand ways to represent the number and type of atoms in a compound or molecule, such as H2O for water or NaCl for sodium chloride, or salt.

All the remaining polyatomic ions contain negative charges. The charge on oxygen is This formula indicates that this compound is made up of twice as many sodium ions as sulfide ions. Combine the symbols to form MgO, the formula for magnesium oxide.

naming and writing chemical formulas worksheet
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Writing Formulas for Ionic Compounds