Back परमाणु सिद्धांत ANP نظرية ذرية Arabic Teoría atómica AST Атамная тэорыя Byelorussian Атомна теория Bulgarian পারমাণবিক তত্ত্ব Bengali/Bangla Atomska teorija BS Teoria atòmica Catalan تیۆریی ئەتۆمی CKB Atomová teorie Czech
In chemistry and physics, the atomic theory explains how our understanding of the atom has changed over time. Atoms were once thought to be the smallest pieces of matter. However, it is now known that atoms are made of protons, neutrons, and electrons. These subatomic particles are made of quarks. The first idea of the atom came from the Greek philosopher Democritus. A lot of the ideas in the modern theory came from John Dalton, a British chemist and physicist.
The theory applies to solids, liquids and gases. It does not apply in the same way to plasmas or neutron stars.