Ionic Bonding

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Information about Ionic Bonding
Education

Published on October 10, 2008

Author: kmawhiney

Source: slideshare.net

Description

ionic compounds, cations, anions, metallic bonding, octet rule

Chapter 7 Ionic and Metallic Bonding

Ions Elements within each group of the periodic table behave similarly because they have the same number of valence electrons. Valence electrons are the electrons in the highest occupied energy level of an elements atoms. Valence electrons determine the chemical properties of an element.

Elements within each group of the periodic table behave similarly because they have the same number of valence electrons.

Valence electrons are the electrons in the highest occupied energy level of an elements atoms.

Valence electrons determine the chemical properties of an element.

Valence Electrons To find the number of valence electrons in an atom of a representative element, simply look at its group number.

To find the number of valence electrons in an atom of a representative element, simply look at its group number.

In forming compounds, atoms tend to gain or lose electrons in order to achieve the electron configuration of a noble gas!!! Octet Rule

In forming compounds, atoms tend to gain or lose electrons in order to achieve the electron configuration of a noble gas!!!

Octet Rule = atoms tend to gain, lose or share electrons so as to have 8 electrons C would like to N would like to O would like to Gain 4 electrons Gain 3 electrons Gain 2 electrons

C would like to

N would like to

O would like to

Key Concept Atoms of metals lose their valence electrons. Atoms of some nonmetals ten to gain electrons or to share with other nonmetallic elements to achieve a complete octet

Atoms of metals lose their valence electrons.

Atoms of some nonmetals ten to gain electrons or to share with other nonmetallic elements to achieve a complete octet

Formation of Cations When an atom loses an electron it produces a positively charged ion, or a cation. The most common cations are those produced by the loss of valence electrons from metal atoms.

When an atom loses an electron it produces a positively charged ion, or a cation.

The most common cations are those produced by the loss of valence electrons from metal atoms.

Electron–Dot Structures for Ions Remove electrons for cations Sodium Atomic number 11 1 s 2 2 s 2 2 p 6 3 s 1 1 Valence electron Na Remove electron to form ion Sodium Ion Atomic number 11 1 s 2 2 s 2 2 p 6 3 s 0 Na + Now has full shell with similar electronic configuration to Neon --Stable noble gas configuration

Remove electrons for cations

Formation of Anions The gain of negatively charged electrons by a neutral atom produces an anion.

The gain of negatively charged electrons by a neutral atom produces an anion.

Electron–Dot Structures for Ions Add electrons for anions Chlorine atomic number 17 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 7 Valence electrons Add electron to form ion Chloride ion atomic number 17 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 8 Valence electrons - Now has full shell with similar electronic configuration to Argon --Stable noble gas configuration Cl Cl

Add electrons for anions

Lewis Dot Structures Mg example 1 s 2 2 s 2 2 p 6 3 s 2 [Ne] 3 s 2 The valence shell is the outermost shell of electrons of an atom. 2 electrons in the valence Shell Mg Use dots to represent Valence Electrons

Electron-Dot Structures Valence electrons represented by dots Electron-dot symbols – Examples: Na •, •Mg•, …

Valence electrons represented by dots

Electron-dot symbols

– Examples: Na •, •Mg•, …

Ionic Bonds Compounds composed of cations and anions are called ionic compounds. Although they are composed of ions, ionic compounds are electrically neutral. The electrostatic forces that hold ions Together in ionic compounds are Called Ionic bonds.

Compounds composed of cations and anions are called ionic compounds.

Although they are composed of ions, ionic compounds are electrically neutral.

Ionic Bonds: One Big Greedy Thief Dog!

Formula Units A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance. Because an ionic compound exists as a collection of positively and negatively charged ions arranged in repeating patterns, its chemical formula refers to a ratio known as a formula unit.

A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance.

Because an ionic compound exists as a collection of positively and negatively charged ions arranged in repeating patterns, its chemical formula refers to a ratio known as a formula unit.

A formula unit is the lowest whole-number ratio of ions in an ionic compound. For NaCl the ratio of the ions is 1:1 (one Na + to one Cl - ) What is the formula unit for Magnesium Chloride?

A formula unit is the lowest whole-number ratio of ions in an ionic compound.

For NaCl the ratio of the ions is 1:1 (one Na + to one Cl - )

What is the formula unit for Magnesium Chloride?

Practice, Practice, Practice Use electron dot structures to determine formulas of the ionic compounds formed when 1. potassium reacts with iodine. 2. Aluminum reacts with oxygen.

Use electron dot structures to determine formulas of the ionic compounds formed when

1. potassium reacts with iodine.

2. Aluminum reacts with oxygen.

Properties of Ionic Compounds Most are crystalline solids at room temperature. High melting points. Conduct electricity when melted or dissolved in water.

Most are crystalline solids at room temperature.

High melting points.

Conduct electricity when melted or dissolved in water.

Practice, Practice Write the formulas for each compound . Barium chloride Lithium oxide Magnesium oxide Calcium flouride

Write the formulas for each compound .

Barium chloride

Lithium oxide

Magnesium oxide

Calcium flouride

7.3 Bonding in Metals The valence electrons of metal atoms can be modeled as a sea of electrons. That is, the valence electrons are mobile and can drift freely from one part of the metal to another. Metallic Bonding Animation

The valence electrons of metal atoms can be modeled as a sea of electrons.

That is, the valence electrons are mobile and can drift freely from one part of the metal to another.

Metallic Bonding Animation

Metallic Bonds: Mellow dogs with plenty of bones to go around.

Alloys Mixtures composed of two or more elements, at least one of which is a metal. Their properties are often superior to those of their component elements.

Mixtures composed of two or more elements, at least one of which is a metal.

Their properties are often superior to those of their component elements.

Learning Check Give the ionic charge for each of the following: A. 12 p + and 10 e - 1) 0 2) 2+ 3) 2- B. 50p + and 46 e- 1) 2+ 2) 4+ 3) 4- C. 15 p + and 18e- 2) 3+ 2) 3- 3) 5-

Give the ionic charge for each of the following:

A. 12 p + and 10 e -

1) 0 2) 2+ 3) 2-

B. 50p + and 46 e-

1) 2+ 2) 4+ 3) 4-

C. 15 p + and 18e-

2) 3+ 2) 3- 3) 5-

Learning Check A. Number of valence electrons in aluminum 1) 1 e - 2) 2 e - 3) 3 e - B. Change in electrons for octet 1) lose 3e - 2) gain 3 e - 3) gain 5 e - C. Ionic charge of aluminum 1) 3- 2) 5- 3) 3 +

A. Number of valence electrons in aluminum

1) 1 e - 2) 2 e - 3) 3 e -

B. Change in electrons for octet

1) lose 3e - 2) gain 3 e - 3) gain 5 e -

C. Ionic charge of aluminum

1) 3- 2) 5- 3) 3 +

Solution A. Number of valence electrons in aluminum 3) 3 e - B. Change in electrons for octet 1) lose 3e - C. Ionic charge of aluminum 3) 3 +

A. Number of valence electrons in aluminum

3) 3 e -

B. Change in electrons for octet

1) lose 3e -

C. Ionic charge of aluminum

3) 3 +

Review.. What is a chemical bond? Force that holds two atoms together What is an ionic bond? An electrostatic force that holds oppositely charged particles together in an ionic compound Forms when….? What are atoms and compounds always trying to achieve? Stability Complete set of valence electrons…

What is a chemical bond?

Force that holds two atoms together

What is an ionic bond?

An electrostatic force that holds oppositely charged particles together in an ionic compound

Forms when….?

What are atoms and compounds always trying to achieve?

Stability

Complete set of valence electrons…

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