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- Atom - Wikipedia
Though the word atom originally denoted a particle that cannot be cut into smaller particles, in modern scientific usage the atom is composed of various subatomic particles
- History of atomic theory - Wikipedia
The word "atom" implied indivisibility, but Dalton defined an atom as being the ultimate particle of any chemical substance, not just the elements or even matter per se
- Atom - Simple English Wikipedia, the free encyclopedia
An atom is made of three main particles: the proton, the neutron, and the electron Protons and neutrons have nearly the same size and mass (about 1 7 × 10−24 grams)
- Atom | Definition, Structure, History, Examples, Diagram, Facts . . .
An atom is the basic building block of chemistry It is the smallest unit into which matter can be divided without the release of electrically charged particles It also is the smallest unit of matter that has the characteristic properties of a chemical element
- atom - Wiktionary, the free dictionary
(chemistry, nuclear physics) atom, the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons
- What is an Atom? - International Atomic Energy Agency
Each atom consists of three types of particles: protons, neutrons and electrons At the centre of an atom is a dense nucleus, which contains protons and neutrons, and is much smaller than the entire atom
- A. What is an Atom? - Linda Hall Library
An atom is the smallest particle into which an element can be divided without losing its chemical identity Atoms consist of a heavy central nucleus surrounded by a cloud of negatively charged particles called electrons
- What is an atom ? | Nuclear Regulatory Commission - NRC
While its name originally referred to a particle that couldn't be divided any more—the smallest thing possible—we now know that each atom is generally made up of smaller particles
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