How to Name Type Three Molecular Compounds with Greek Prefixes

Right now we learned about ionic compounds metal and non-metal. There are two types, type one and type two. Type

one has only one type of ion for the metal. Type two has more than one type of iron for the metal. There are another

type of compounds called type three compounds. Basically you get type three compounds from non-metal and non-metal

bonding. When non-metal element make a compound with nonmetal, you make type three compounds. Now we are learning

about naming namings of compounds. For naming for these molecular compounds we need to learn something called prefaces.

Greek prefaces. This is something you have to remember. It will need some practice. You have to know mono means

one di means two. Try three. Tetra penta hexa like that you should know the meaning of

those Greek prefixes. We have to study that one. And we need that information to name this non-metal and non-metal

compounds. Let's see how we are going to use it. I'm going to skip this one because let's go to example then it's

going to be much easier to understand. It says binary molecular compounds with two nonmetals. Binary means actually

two. And let's try to name this. I'll just go over very brief. It says preface name of the first element preface base

of the second element plus ID. What does that mean? So let's try the name of N205 using this formula. First we have write

the preface. You can see there are two nitrogens here in N2. First preface belongs to the first element is two. Two

means die in the prefaces. First I will write D. Then I have to write the name of the first element. First element is

nitrogen. I will write the nitrogen. Then we have another preface that is for the second element. So the second

element we have five oxygen. Five means penta. I will write penta. Then the base name of the second element plus ID. What

does that mean? Second element is we know oxygen and but we don't need the name of the element is say the base name

base name is ox. If you remember that when we are learning about all the compounds chloride the base name is

chloro fluide. For fluoride the base name is flow just like that base name of oxygen

is ox. Then we have tried oxide. Basically this is same like the ion 2 minus is oxide. But please understand

there are no ions here. There are no ions here. This is a molecule. What does that mean? Because this is a nonmetal.

This is a nonmetal. It is not ionic. It behaves like a molecule. That means just like hydrogen. I told you another

example. If you have a balloon of hydrogen and if you zoom it and zoom it and zoom it in, you will see two

hydrogen atoms together. But in sodium chloride which is an ionic compound they are always attached to different cations

and annions like a latis big giant latice there are no such thing as molecules in ion here what I'm trying to

say is even though we say di nitrogen penta oxide basically we write the name of the anion there are no annions here

it is just a form of representation according to this this is the name but the correct way is not exactly whenever

We see two wows you know wow a e i o u two wow together we combine them. In this case we do not say di nitrogen

pentto oxide we just remove a and we write pentoxide x i d pentoxide di nitrogen penttoxide for this one let's

see2 how do we write it as a fresh even without knowing this is a nonmetal

chlorine is a nonmetal it is a molecular compound when you are writing nonmetals and nonmetals this is the way we have to

use we will write two means di then name of the first element sulfur s u L F U R sulfur then again write D C H L O R I D

E just like the name of the annion usually we write these dice together dulf dchloride next one how do we write

first start with what d nitrogen now we have how many oxygen are there one one we have to write monorite mono oxide now

again we have a exception because there are two O's here we don't write two O's we write only one know we say monoxide

we just get rid of one just like we don't say pent oxide we say penttoxide just like that we don't say monoxide we

say monoxide next one how would you write a f6 how many selenium are there one when I'm looking at the formula

instruction or whatever I would write mono mono means there's only one selenium right monoselenium monoselenium

there are six florine six means hexa hexa florine is base name and ide just like fluoride Right? So this is the name

we get from this formula. But this is not correct. The reason is I told you that as chemist we have weird thing

about one. Whenever we see one in the first element we don't write mono. Whenever we see mono in the first

section first prefix we don't write it. We write selenium hexaflloride. That is something you have to understand. We

never write mono in the first time. You will understand that in a second when you see this one. The way you have write

from this expression is mono carbon because there's one carbon right and one oxygen also mono for the oxygen oxide

and now we discussed that when there are two O's monoxide we don't say that we say monoxide since it is a mono in the

first element we don't write it we just say carbon monoxide there are certain exceptions just like exception for mono

in the first element we don't write it and also whenever we see monoxide or penttoxide we combine those two and get

rid of one