Atom

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Nuclear Energy Science Tracer Bullet (Library of Congress)
Nuclear Power (Wolfram Alpha)

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Physical Realm
Physical Laws (Constants) Relativity
Matter Molecule, Atom (Periodic Table), Particle
Force Gravity, Electromagnetism (Light, Color)

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General

Portal

CODATA Internationally recommended values of the Fundamental Physical Constants, Atomic and Nuclear (NIST Reference on Constants, Units and Uncertainty)
Radiation, Radioactivity & Radiobiology (Martindale’s Reference Desk)

Dictionary

atom : the smallest particle of an element that can exist either alone or in combination — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Thesaurus

Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Encyclopedia

Atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale).

Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and typically a similar number of neutrons. Protons and neutrons are called nucleons. More than 99.94% of an atom’s mass is in the nucleus. The protons have a positive electric charge, the electrons have a negative electric charge, and the neutrons have no electric charge. If the number of protons and electrons are equal, that atom is electrically neutral. If an atom has more or fewer electrons than protons, then it has an overall negative or positive charge, respectively, and it is called an ion.

The electrons of an atom are attracted to the protons in an atomic nucleus by this electromagnetic force. The protons and neutrons in the nucleus are attracted to each other by a different force, the nuclear force, which is usually stronger than the electromagnetic force repelling the positively charged protons from one another. Under certain circumstances, the repelling electromagnetic force becomes stronger than the nuclear force, and nucleons can be ejected from the nucleus, leaving behind a different element: nuclear decay resulting in nuclear transmutation.

The number of protons in the nucleus defines to what chemical element the atom belongs: for example, all copper atoms contain 29 protons. The number of neutrons defines the isotope of the element. The number of electrons influences the magnetic properties of an atom. Atoms can attach to one or more other atoms by chemical bonds to form chemical compounds such as molecules. The ability of atoms to associate and dissociate is responsible for most of the physical changes observed in nature and is the subject of the discipline of chemistry. — Wikipedia

Atoms (Eric Weisstein’s World of Physics, Wolfram Research)
Encyclopædia Britannica

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Atom (WolframAlpha)
Nuclear Power (Wolfram Alpha)

Science

Atomic 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 around the nucleus and the processes by which these arrangements change.

The term atomic physics can be associated with nuclear power and nuclear weapons, due to the synonymous use of atomic and nuclear in standard English. Physicists distinguish between atomic physics — which deals with the atom as a system consisting of a nucleus and electrons — and nuclear physics, which considers atomic nuclei alone. — Wikipedia

Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions. Other forms of nuclear matter are also studied. Nuclear physics should not be confused with atomic physics, which studies the atom as a whole, including its electrons. — Wikipedia

Preservation

History





How Can You See an Atom? – Legends of Chemistry (American Chemical Society)

Museum


National Museum of Nuclear Science & History (Albuquerque, New Mexico)

Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

Book

ISBNdb

Education





https://fusedweb.llnl.gov/
Atoms Around Us (Chem4Kids)
Nuclear Physics (Physics4Kids)



Atom in a Box: Real-Time Visualization of the Quantum Mechanical Atomic Orbitals (Dauger Research)

Course



Crash Course Physics (YouTube)

Introduction to Nuclear and Particle Physics (MIT OCW Physics)
Nuclear Science and Engineering (MIT OCW Physics)
OER Commons: Open Educational Resources

Community

Organization

International Atomic Engergy Agency

News

Atomic Physics (AAAS EurekAlert)
Science News, Atom & Cosmos
Scientific American
Phys.Org
NPR Archives

Government

Document

USA.gov

Expression


Humor

Scientist Splits Atom, Finds Toy Prize Inside (Satire Wire)

Hobby

The Man Who Hunts Hidden Radioactive Objects (Chris Baraniuk, BBC Future)

Poem

OEDILF: The Omnificent English Dictionary In Limerick Form

Music

Song Lyrics

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Study identifies a transition in the strong...
    on February 26, 2020 at 4:00 pm

    Most ordinary matter is held together by an invisible subatomic glue known as the strong nuclear force—one of the four fundamental forces in nature, along with gravity, electromagnetism, and the weak force. The strong nuclear force is responsible for the push and pull between protons and neutrons in an atom's nucleus, which keeps an atom from collapsing in on itself.

  • Engineers ensure quantum experiments get off to...
    on February 26, 2020 at 2:09 pm

    The quantum mechanical properties of electrons are beginning to open the door to a new class of sensors and computers with abilities far beyond what their counterparts based in classical physics can accomplish. Quantum states are notoriously difficult to read or write, however, and to make things worse, uncertainty about those states' starting conditions can make experiments more laborious or even impossible.

  • Researchers report more accurate measurement of...
    on February 26, 2020 at 2:06 pm

    A research team from Bochum has determined the size of neutrons in a more direct way than ever before, thus correcting previous assumptions.

  • Design of the W7-X fusion device enables it to...
    on February 25, 2020 at 8:09 am

    A key hurdle facing fusion devices called stellarators—twisty facilities that seek to harness on Earth the fusion reactions that power the sun and stars—has been their limited ability to maintain the heat and performance of the plasma that fuels those reactions. Now collaborative research by scientists at the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) and the Max Planck Institute for Plasma Physics in Greifswald, Germany, have found that the […]

  • Ability to control spin of atom-like impurities...
    on February 24, 2020 at 4:00 pm

    A team of international scientists investigating how to control the spin of atom-like impurities in 2-D materials have observed the dependence of the atom's energy on an external magnetic field for the first time.