History of Chemistry

He taught that all matter is made of indivisible atoms moving in the void — an idea that waited two thousand years to be vindicated.

Earth, water, air, and fire, mixed in varying proportions, framed the theory of matter that alchemy inherited for two millennia.

The great Islamic alchemist systematised laboratory practice — distillation, crystallisation, and the preparation of acids — laying groundwork for chemistry.

He classified substances into a rational scheme and described precise chemical procedures, moving alchemy toward empirical practice.

He turned alchemy toward medicine, arguing that the body is chemical and that 'the dose makes the poison' — a founder of pharmacology.

In The Sceptical Chymist he attacked the classical elements and defined an element as a substance that cannot be broken down — chemistry's true start.

His phlogiston theory — a fiery substance released in burning — was wrong, but it organised chemistry and drove a century of experiment.

Boyle's dialogue demanded that chemistry rest on experiment, not on the four elements or the alchemists' three principles.

He discovered hydrogen and showed that burning it produces water, proving water is a compound, not an element.

He isolated oxygen and several other gases, giving Lavoisier the crucial experiment that would overturn the phlogiston theory.

The father of modern chemistry established conservation of mass, named oxygen and hydrogen, and put reactions on a quantitative footing.

The first modern chemistry textbook listed the known elements and codified the new quantitative, oxygen-based chemistry.

He revived atomism as a quantitative theory: each element has atoms of a characteristic weight that combine in whole-number ratios.

He proposed that equal volumes of gas hold equal numbers of molecules, the key to atomic weights and the number that bears his name.

He determined atomic weights with great care and invented the modern letter symbols for the elements still used on every formula.

By making an organic compound from inorganic salts, Wöhler broke the belief in a special 'vital force', founding organic chemistry.

He worked out how carbon atoms chain and ring together, and his benzene ring unlocked the vast architecture of organic molecules.

He arranged the elements by weight and property into a periodic table that left gaps — and correctly predicted the elements that filled them.

The first Nobel laureate in chemistry, he founded stereochemistry and chemical kinetics, giving molecules three-dimensional shape and reactions their rates.

He explained that salts split into charged ions in water, founding physical chemistry and later warning of carbon dioxide's warming effect.

Mendeleev's table revealed a deep order in matter, becoming the single most recognisable map of the chemical world.

Her study of radioactivity discovered polonium and radium and won Nobel Prizes in both physics and chemistry, opening the science of the nucleus.

He pictured the covalent bond as a shared pair of electrons, giving chemistry the dot diagrams and acid–base ideas still taught today.

He used quantum mechanics to explain the chemical bond and molecular structure, uniting physics and chemistry at the deepest level.

Synthesising ammonia from air gave the world artificial fertiliser, feeding billions — and, in the same century, feeding explosives.

Pauling's landmark book explained bonding through electron sharing and resonance, becoming one of the most cited works in all of science.

The greatest synthetic chemist of the century built complex natural molecules — quinine, chlorophyll, vitamin B12 — atom by atom.

The double helix showed that heredity is written in a chemical molecule, binding chemistry, biology, and physics into molecular biology.

The discovery of a hollow sixty-atom carbon sphere revealed a whole new family of carbon forms and launched modern nanochemistry.

Commercialised rechargeable lithium cells stored energy densely enough to power phones, laptops, and electric cars — reshaping daily life.

A formal set of principles redirected chemical design toward less waste, safer solvents, and renewable feedstocks — sustainability as method.