Originally made for the BTEC National Applied Science Level 3 course, this is the second lesson of Unit 1 Learning Aim A2.
The lesson introduces the concept of first ionisation energies and electron affinity trends across period and down groups. Students will define each and apply knowledge to problems and tasks throughout the lesson.
Anomalies in period 2 & 3 are explained simply using knowledge gained about how the sub-shells are filled.
Finally trends in electron affinity are explained and also explains why the second electron affinity of oxygen is higher than the first.
Final plenary are some past exam questions from A-level Chemistry chosen to closely match the content.
Originally made for the BTEC National Applied Science Level 3 course, this is the first lesson of Unit 1 Learning Aim A2.
The lesson introduces the concept of atomic radius trends in a simple format, getting the students to make predictions for trends based on prior knowledge and addressing misconceptions. Trends across periods and down group addressed.
Then it moves onto how the radii of cations and anions change across periods and down groups.
Finally trends in electronegativity is discussed and then students have to use data to describe and explain trends across periods and down groups.
Final plenary are some past exam questions from A-level Chemistry.
This is the third lesson in a series of lessons designed for the Applied Science BTEC - although it can easily be used as a standalone lesson to help explain mp and bp trends across periods and down groups.
The lesson is in the style of an interactive lecture where I deliver it with lots of student discussion and questioning, ending with an exam style question plenary using knowledge gained during the lesson.
Homework is given at the end to stretch and challenge the students understanding - assuming they have learned about electronic structure and interaction between the nuclear charge and the valence electrons.