Bonding Between Atoms
Home Preliminary Information Table of Contents Bonding Between Atoms Nomenclature Lab Work Wrap-Up

 

Bonding Between Atoms

Let's start by briefly reviewing bonding between atoms. We know that bonding comes from the attraction between the positive charge of the nucleus and the negative charge of the electrons. The varying tendencies of atoms to gain or lose electrons allows them to attract one another in various ways and form different kinds of bonds.

Determining Bond Types

Remember that the inert gases are not particularly good at either gaining or losing electrons and so they are not particularly good at forming bonds. We won't be concerned with them here.

 There are three combinations in which metallic and nonmetallic atoms can bond to one another.  You should remember this from lesson 7.
metallic atoms nonmetallic atoms
down arrowdown arrow down arrowdown arrow down arrowdown arrow
metallic
bonds
ionic
bonds
covalent
bonds

Keep in mind that we are still using this simple idea to determine the type of bonding by looking at the types of atoms that are involved. 

Identifying the type of bonding is the first step in being able to correctly name a chemical.  

 

Practice

Try your hand at using this generality by doing exercise 1 in your workbook. You can check your answers below.

 

Answers

Iron bonds to iron using metallic bonding. Sodium bonds to iron with metallic bonding. Sodium bonds to iodine with ionic bonding. Iron bonds to iodine with ionic bonding. Nitrogen bonds to iodine with covalent bonding. Nitrogen bonds to nitrogen with covalent bonding.

If you got all of these correct, continue. If not, check with the instructor, explain your answers and find out why these pairs of atoms are considered to have the kinds of bonds listed.

Ionic and covalent bonding result in compounds.  Metallic bonding between two (or more) different metals always results in alloys, or mixtures, without fixed compositions.  There are systematic ways of naming ionic and covalent compounds, and we will learn how to name them in this lesson.  There is not yet a systematic way of naming alloys like those for naming covalent and ionic compounds. In part, this is because alloys are not compounds, their composition is variable and their names need to reflect that. Generally, we use common names like brass, bronze, or steel or technical names like alnico I, alnico II, chromium steel or high carbon steel.  We will not be concerned with naming these alloys.

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