From 1809 onwards, light metals, such as magnesium, aluminium, and titanium, were discovered, as well as less well-known heavy metals including gallium, thallium, and hafnium.
Sejak tahun 1809 dan seterusnya, ditemukan logam ringan, seperti magnesium, aluminium, dan titanium, dan juga logam berat yang kurang terkenal termasuk galium, talium, dan hafnium.