Learning Paths
Each learning path is one chapter: a guided route through a topic, one small course at a time. Pick a class to see its chapters in order.
Chapter 3
Development of the Periodic Table, Periodic Trends, Groups and Families
Why does sodium burn in water while neon does nothing at all? The periodic table answers it. In this chapter you follow how chemists arranged the elements, from triads and octaves to Mendeleev and the modern periodic law, link the table to electronic configurations, and explain the trends in size, ionisation enthalpy, electron gain enthalpy and electronegativity. Python turns the table into data you can plot.
2 courses
Chapter 9Contains Standard content
Development of the Periodic Table, Periodic Trends, Groups and Families, Electronic Configuration and Valency
There are more than a hundred elements. How can anyone remember them all? A chemist does not. A chemist reads the periodic table, a chart that puts each element where its properties are easy to guess. In this chapter we see how the first lists were made, how Mendeleev left gaps for elements that nobody had found, and how the modern table is built on the electrons of an atom. Then we use the table to predict size, valency, reactivity and the nature of oxides. Python helps us to test the patterns.
4 courses