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If an atom has more electrons than protons, then it has an overall negative charge and is called a negative ion (or anion). Conversely, if it has more protons than electrons, it has a positive charge and is called a positive ion (or cation). The electrons of an atom are attracted to the protons in an atomic nucleus by the electromagnetic force.
The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. Atomic 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 discoveries.
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This was in a gold atom known to be 10 −10 metres or so in radius—a very surprising finding, as it implied a strong central charge less than 1/3000th of the diameter of the atom. The Rutherford model served to concentrate a great deal of the atom's charge and mass to a very small core, but did not attribute any structure to the remaining ...
The Slovak Wikipedia (Slovak: Slovenská Wikipédia) is the edition of Wikipedia in Slovak. It was started on before 23 September 2003, [1] only becoming active in the summer of 2004. It cleared the 15,000-article mark in September 2005 and the 50,000-article mark in August 2006 and the 100,000 article mark in August 2008.
Prima SK is a channel of the FTV Prima group, whose broadcasts are directed to the territory of Slovakia. [1] Prima SK began broadcasting in Slovakia as Prima Plus on 23 January 2017. The program is mainly composed of Prima Television's own creations.
In the first type, a nucleophile, an atom or molecule with an excess of electrons and thus a negative charge or partial charge, replaces another atom or part of the "substrate" molecule. The electron pair from the nucleophile attacks the substrate forming a new bond, while the leaving group departs with an electron pair.
A Is for Atom (1953) is a 14-minute promotional animated short documentary film created by John Sutherland and sponsored by General Electric (GE). The short documentary, which is now in the public domain, explains what an atom is, how nuclear energy is released from certain kinds of atoms, the peacetime uses of nuclear power, and the by-products of nuclear fission.