What is Ionisation Energy and Electronegativity?
This post will introduce the concepts of ionisation energy and electronegativity and their trends across the periodic table for Prelim Chemistry.
- Demonstrate, explain and predict the relationships in the observable trends in the physical and chemical properties of elements in periods and groups in the periodic table, including but not limited to:
- First ionisation energy and electronegativity
Ionisation Energy and Periodicity
Ionisation energy is the amount of energy required to expel an electron from an atom thus creating an ion (a charged atom). First ionisation energy is the energy required to expel an electron from a neutral atom. It is unique for each element. This video will take you through some more about ionisation energy and describe the trends.
Electronegativity and Periodicity
Electronegativity describes the ability that an atom has in attracting electrons. Like, ionisation energy, it is unique for each element. This video will take you through some more about electronegativity and its trends across the periodic table.
Exceptions to the Ionisation Energy Trend
There are some exceptions to the ionisation energy trend which can be explained with electron spin. The course, however, does not go through electron spin so this is extension work. The video below gives an explanation of how and why some elements are exceptions to the ionisation energy trend.