Leucippus and Democritus have proposed intuitively the existence of atoms approx. 2 450 years ago. This wasn't an experimental discovery. They were philosophers not chemists.
Martin Heinrich Klaproth , German chemist, discovered zirconium.
Chromium was discovered in 1797 by the French chemist Nicholas Louis Vauquelin.
Democritus and his mentor Leucippus postulated the existence of the atom.
Neon was discovered by Scottish chemist William Ramsay and English chemist Morris Travers in 1898.
Argon was discovered by the Scottish chemist Sir William Ramsay and English chemist Lord Rayleigh in 1894. They identified the element by isolating it from air and determining its properties.
British chemist Sir Humphry Davy, who isolated many other elements besides sodium.
The concept of the atom was first proposed by ancient Greek philosophers, including Leucippus and Democritus in the 5th century BC. They believed that all matter is composed of indivisible particles called atoms.
Mercury is known from many thousands years; a discoverer is not known.
Coining of the term "atom" and the idea that matter was composed of small, invisible, indivisible particles.
Ancient Greek philosophers such as Democritus and Leucippus did not have experimental evidence to support their theory of the atom. Their idea of the atom was purely philosophical and lacked experimental verification until much later.
Because John Dalton - the discoverer - was a member.
Leucippus was not an experimentalist 2 500 years ago.