Page 144 - Science Course 2 (Book 1)

Ionic and Metallic Bonding Mo.5-L3a: What is Ionic Bonding?
Lesson 3

Ionic bond
is the attraction between positively and negatively
In this topic, you will learn the following charged ions in an ionic compound.
lessons: Energy
Mo.5–L3a: What is Ionic Bonding?
Mo.5–L3b: What is Metallic Bonding?

Mo5-L3a What is Ionic Bonding? Electron

KEY CONCEPTS: Neutral atom Neutral atom
1. What holds ionic compounds together? Sodium Chlorine

Positive ion Negative ion
Vocabulary A-Z Sodium Chlorine

Let us learn some vocabulary

Ion
is an atom that is longer longer electrically neutral
because it has lost or gained valence electrons.

Neutral Atom Positively charged ion Let’s Begin
Same number of More protons than
protons and electrons electrons
Understanding Ions

An ion is an atom that is no longer electrically
neutral because it has lost or gained valence
electrons.

Negative Ion Positive Ion
Free Nucleus
8 Protons Electron 8 Protons
8 Neutrons 8 Neutrons
8 Electrons 7 Electrons + +
– – –
+ +
Electron
–

Gains an electron Loses an electron

Because electrons have a negative charge, losing or
8 Protons gaining an electron changes the overall charge of an
8 Neutrons atom.
9 Electrons
Negatively charged ion Atoms that lose valence electrons become ions with
More electrons than a positive charge.
protons

137