Bonding

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Properties of Materials

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Basic knowloedge about solids

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Chemcial/ionic bonding

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Bonding

Ionic Bond

Cannot conduct electricity in solid form ; Can conduct electricity in liquid form

Cannot conduct : The ions are not free to move about Can conduct : The ions are free to move about

Soluble in water

High melting and boiling points

Structure of Ionic Compounds

Arranged in giant lattice structure or crystal lattice

Form giant ionic structures

Compounds that contain ionic bonds are called ionic compounds

Examples?

Sodium Chloride

Magnesium Fluoride

Attracted to both elements by electrostatic attraction

Formed between Metals and Non-Metals

May also known as electrovalent bond

Covalent Bond

Physical properties

Cannot conduct electricity

Do not have free-moving ions or electrons to conduct electricity

Insoluble in water

Low melting and boiling points

Very little heat energy is required to overcome the intermolecular forces.

Molecules of Compounds

Molecules made up of two or more different types of atoms linked together by covalent bonding are called molecular compounds or covalent compounds.

Molecules of Elements

A double bond is formed when two pairs of electrons are shared between two atoms.

Sharing of two electrons forms a single covalent bond

Introduction

A molecule is a group of two or more atoms held together by covalent bonds.

Molecules are formed when atoms combine

Formed between atoms that share electrons is called a covalent bond