This video explains how and why metals and non-metals bond together to form ionic compounds. You'll see the electron transfer that creates ions, how to draw dot-and-cross diagrams, and why the giant ionic lattice gives these compounds their characteristic high melting points and conductivity behaviour. Perfect if you want to understand ionic bonding from first principles before moving on to writing formulae.

What You Will Learn

00:27Why atoms transfer electrons to achieve stability and what this has to do with electron configuration.

02:47How to use electron configuration notation (2,8,1 style) to predict which electrons an atom will lose or gain.

03:05What cations and anions are and how they form from neutral atoms.

05:09How to draw dot-and-cross diagrams to represent electron transfer in ionic bonding.

05:22How to use dot-and-cross diagrams to work out the empirical formula of an ionic compound.

06:50What a giant ionic lattice is and how the regular arrangement of ions explains the properties of ionic compounds.

13:09Why reactivity trends in Group 1 can be predicted from electron configuration.

This video gives you a reliable method for writing the correct formula of any ionic compound — from simple binary salts right through to polyatomic ions and variable-valency metals. You'll start with the dot-and-cross approach to see why charges must balance, then learn the crossover shortcut that gets you to the answer quickly in an exam. Roman numerals, carbonate, sulfate, hydroxide — all covered.

What You Will Learn

00:25How to apply the concept of ionic bonding to write the formula of any ionic compound.

01:23How to use the periodic table to predict ion charges for main group elements.

02:12How to draw dot-and-cross diagrams for compounds involving 2+ and 2- ions.

04:02How to use charge balance to determine the correct ratio of ions in a compound.

04:38How to write the empirical formula of an ionic compound from ion charges using the crossover method.

06:00How to identify and use the charges of common polyatomic ions in formulae.

08:12How transition metals with variable valency are named and how to work out their charges from a formula.

09:53How Roman numeral notation indicates the charge on a transition metal ion in a compound name.

12:09How to apply all of these skills together to write and name ionic compounds you have not seen before.