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Atom | Simple English Wikipedia, the free encyclopedia
- The word "atom" comes from the Greek (ἀτόμος) "atomos", which means indivisible or uncuttable. One of the first people to use the word "atom" is the Greek philosopher Democritus, around 400 BC. He thought that everything was made of particles called atoms, which could not be divided into smaller pieces. Some Hindu, Jain, and Buddhist philosophers a...
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Atomic physics | Wikipedia
WEBAtomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. Atomic physics typically refers to the study of atomic structure …
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Atom | Definition, Structure, History, Examples, Diagram, & Facts
WEBAug 17, 2024 · What is an atom? Are all atoms the same size? What does the mass of an atom consist of? How is the atomic number of an atom defined? atoms How atoms can …
Atomism | Wikipedia
WEBAtomism (from Greek ἄτομον, atomon, i.e. "uncuttable, indivisible") [1][2][3] is a natural philosophy proposing that the physical universe is composed of fundamental indivisible components known as atoms. References to the …
History of atomic theory | Wikipedia
WEBAtomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years in response to scientific …
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Atomic nucleus | Wikipedia
WEBThe atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 …
Atomic radius | Wikipedia
WEBAtomic radius - Wikipedia. Diagram of a helium atom, showing the electron probability density as shades of gray. The atomic radius of a chemical element is a measure of the …
Atomic number | Wikipedia
WEBThe atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei composed of protons and neutrons, this is equal to the proton number …
Atomic theory | Simple English Wikipedia, the free encyclopedia
WEBIn 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. …
Atomic number | Simple English Wikipedia, the free encyclopedia
WEBThe atomic number (symbol: Z) of an atom is the number of protons in the nucleus of the atom. [1][2] The atomic number of an atom identifies which element it is. In a neutral …
Atomic physics | Simple English Wikipedia, the free encyclopedia
WEBAtomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons …
Ion | Wikipedia
WEBElectron transfer between lithium (Li) and fluorine (F). Forming an ionic bond, Li and F become Li + and F − ions.. An ion (/ ˈ aɪ. ɒ n,-ən /) [1] is an atom or molecule with a net …
Basic concept and structure of an atom | Britannica
WEBatom, Smallest unit into which matter can be divided and still retain the characteristic properties of an element. The word derives from the Greek atomos (“indivisible”), and …
Nuclear physics | Simple English Wikipedia, the free encyclopedia
WEBNuclear physics is the part of physics that studies the nucleus of the atom. Everything on the earth is made up of atoms; they are the smallest part of a chemical element that still …
Atomic nucleus | Simple English Wikipedia, the free encyclopedia
WEBThe nucleus of an atom is made up of protons and neutrons (two types of baryons) joined by the nuclear force. These baryons are further made up of sub-atomic fundamental …
2.2: Atomic Structure | Chemistry LibreTexts
WEBMay 18, 2021 · The concept that atoms play a fundamental role in chemistry is formalized by the modern atomic theory, first stated by John Dalton, an English scientist, in 1808. It …
Rutherford scattering experiments | Wikipedia
WEBThe prevailing model of atomic structure before Rutherford's experiments was devised by J. J. Thomson. [1]: 123 Thomson had discovered the electron through his work on cathode …
What is an atom? Facts about the building blocks of the universe
WEBDec 15, 2021 · Atoms are the building blocks of matter and were created after the Big Bang. They are the smallest unit of an element that still retains its properties.
Atoms for Peace | Wikipedia
WEBAtoms for Peace. " Atoms for Peace " was the title of a speech delivered by U.S. President Dwight D. Eisenhower to the UN General Assembly in New York City on December 8, …
Observable universe | Wikipedia
WEBDark matter (26.8%) Dark energy (68.3%) [6] The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its …
Periodic Table | Ptable
WEBInteractive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
IBM (atoms) | Wikipedia
WEBIBM (atoms) IBM in atoms was a demonstration by IBM scientists in 1989 of a technology capable of manipulating individual atoms. [1] A scanning tunneling microscope was used …
Atoms — Vikipēdija
WEBAtoms (sengrieķu: ἄτομος, atomos — ‘nedalāms’) ir vielas pamatvienība, kuru pamatā veido atoma kodols, un tam savukārt apkārt riņķo negatīvi uzlādēts elektronu mākonis.