Jöns Jacob Berzelius

Lore & Background

Berzelius was born in Väversunda, Östergötland, Sweden. He lost both parents early and was raised by relatives.

Reader's Guide

Berzelius's significance lies in his rigorous empirical approach and foundational contributions to stoichiometry, atomic weights, and chemical notation. He demonstrated that inorganic compounds obey definite proportions, providing evidence for Dalton's atomic theory, and disproved Prout's hypothesis by showing atomic weights are not integer multiples of hydrogen's. His system of chemical notation—using one- or two-letter Latin abbreviations and superscripts for atom counts—evolved into modern notation. He also articulated electrochemical dualism, proposing compounds are oxide salts bonded electrostatically. He discovered cerium and selenium, first isolated silicon and thorium, and named phenomena such as isomerism, allotropy, and catalysis.

Did You Know?

• Berzelius was universally known as Jöns Jacob Berzelius.
• He constructed his own battery based on Alessandro Volta's electric pile, beginning his work in electrochemistry.
• He worked with Anna Sundström, who acted as his assistant and was the first female chemist in Sweden.
• Berzelius co-discovered cerium with Wilhelm Hisinger, and Martin Heinrich Klaproth independently discovered it at the same time.