Chemistry
High School (11–12)
The Periodic Table › Development of the Periodic TableThe Periodic Table › Periodic TrendsThe Periodic Table › Groups and FamiliesChapter 3Classification of Elements and Periodicity in Properties
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.
Part of Chemistry · High School (11–12) (chapter 3)
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Building the Periodic Table
From Dobereiner's triads to Mendeleev's gaps and Moseley's atomic numbers: how the periodic table was built, how new elements are named, and how the s, p, d and f blocks follow from electron configurations.
Periodic Trends in Properties
How the size of atoms and ions, the ionisation enthalpy, the electron gain enthalpy and the electronegativity change across a period and down a group, and how they decide valence and reactivity.