Atomic theory
Atomic Theory
Atomic theory (pronunciation: /əˈtɒmɪk ˈθɪəri/) is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms.
Etymology
The term "atom" comes from the Ancient Greek word "atomos" (ἄτομος), which means "indivisible". The term "theory" comes from the Greek word "theoria" (θεωρία), which means "a looking at, viewing, beholding".
Related Terms
- Atom: The basic unit of a chemical element, and the smallest unit of matter that retains the properties of an element.
- Molecule: A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- Element: A substance whose atoms all have the same number of protons.
- Compound: A substance formed when two or more chemical elements are chemically bonded together.
- Chemical reaction: A process that leads to the transformation of one set of chemical substances to another.
- Chemical bond: A lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.
History
The concept of an atom as an indivisible component of matter was first proposed by early Indian and Greek philosophers. In the 19th century, John Dalton further developed this theory into the first modern atomic theory, the foundation for the modern science of chemistry.
Modern Atomic Theory
Modern atomic theory is a theory that all matter is composed of tiny discrete finite indivisible indestructible particles called atoms. Atoms of the same element are identical in shape, mass, and other properties; atoms of different elements differ in these properties.
See Also
External links
- Medical encyclopedia article on Atomic theory
- Wikipedia's article - Atomic theory
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