Consider the following examples: Write the formula for magnesium chloride. When the anion and the cation are combined, the charges must "cancel". In other words, the total number of positive charges has to be the same as the total number of negative charges.
Names and formulas of ionic compounds Video transcript - [Instructor] Let's get some practice now thinking about how ions typically form, how they might form compounds and how we name those compounds. So let's start with something in group one.
In this first column, this first column is often known as alkali metals. So let's start with potassium. K is the symbol for potassium. Now things in group one here, one way to think about is their outermost shell has one electron in it.
So they wouldn't mind losing that electron.
So when they ionize, they tend to lose an electron and become a cation, a positive ion. And so let's look at a situation where I have some potassium that has been ionized. I could write it just like this, we've seen that in previous videos and we can refer to this just as a potassium ion, we could refer to this as potassium one plus.
We could refer to this as a potassium cation. Now let's go on to the other side of the periodic table. Things that would really love to grab an electron. So things in group, in the halides, which is this column right over here.
So these are the halides.
They have seven electrons in their outermost shell. They would love to have eight, so they tend to be really good at grabbing electrons.
And so let's say we're dealing with chlorine, and chlorine is able to ionize. So it's able to grab an electron. When chlorine grabs an electron, it will be a negatively charged ion, so you could write it as Chlorine one minus, but the way that we generally refer to an anion, a negatively charged ion, instead of just calling this the chlorine anion, we would call this chloride.
So this we would refer to as Chloride. 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.
The ionic compound they would form, we would write as, you'd write your positive ion first and then you would write your negative ion. And this right over here would be described as potassium chloride.
Let me write that down.
Now you might be saying, "Well, I just," Let me rewrite the whole thing. 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?
Naming and Writing Formulas for Compounds Ionic Compounds Two Systems of Naming: Stock (Roman numerals) Old Stock System Binary Compounds: Write the name of the positive ion 1st Check to see if it has more than one oxidation #-if it does determine the charge and use a Roman numeral to designate the charge Write the root name of the negative ion-add the ending -ide Compounds with . This page is part of a project to teach high school chemsitry using a website as an integrated in class tool. You will find, Flash animations, PDF files of labs and. Writing formulas for binary molecular compounds is like decoding a message. If you can name a compound from its formula, then it's easy to do the reverse. We will rely on some of the same rules.
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.Molecular compounds (sometimes called covalent compounds) follow a completely different set of rules for naming and formula writing than ionic compounds.
The bonds in molecular compounds are. WRITING FORMULAS AND NAMING MOLECULAR COMPOUNDS Molecular compounds are composed of two or more nonmetals covalently joined.
together. There are several variations of nomenclature for molecular compounds, but here we will only discuss the prefix method for binary molecular compounds.4/4(1).
Chemical Formula Writing & Nomenclature Binary Acids When these compounds are pure, the naming rules follow those of the binary molecules that we will cover later.
Until further notice, we will name polyatomic ion and producing a molecular substance. Naming Ternary Acids. Writing Formulas for Ionic Compounds Containing Polyatomic Ions Writing a formula for ionic compounds containing polyatomic ions also involves the same steps as for a binary ionic compound.
Write the symbol and charge of the cation followed by the symbol and charge of the anion. Sep 08, · How to Name Covalent Compounds. In this Article: Learning Numerical Prefixes for Covalent Compounds Naming Basic Binary Compounds Naming Acids and Oxyacids Community Q&A In chemistry, a molecule is covalent when it is formed from bonds between nonmetals.
Naming these types of compounds is usually a matter of knowing the names of the atoms in the molecule as Views: 55K. Molecular Compounds and Acids Quiz.
Give the name for the molecular compounds and acids.