All atoms areelectrically neutral, because every atom has an equal number of electrons and protons. Nearly all of the atom'smassis located in the nucleus. The nucleus is tiny compared with the total size of the atom. Most of the atom's volume holds the electron cloud, whose mass is tiny...
Arguments are presented that the theoretical definition of an atom in a molecule or of a functional grouping of atoms that derive from experimental chemistry must be unique. Definitions based on the orbital model or, as recently proposed, in terms of domains defined by isovalued density envelopes...
Formal charge (FC) is the electric charge of an atom in a molecule. It is calculated as the number of valence electrons minus half the number of electrons shared in a bond minus the number of electrons not bound in the molecule. Formal charge is used to estimate the way electric charge ...
The nucleus (plural nuclei) is the central part of theatom; it contains the protons and neutrons. Mass, Volume and Density Nearly all of the atom's mass is contained in the nucleus; the volume of the nucleus is tiny compared with the atom's total volume; thus the density of matter in...
Explore atoms. Learn the definition of an atom and understand its structure with diagrams and explanations. See atom examples and find the elements...
while the size of a hydrogen atom is about half of an angstrom. The angstrom is used in solid-state physics, chemistry, and crystallography. The unit is used to cite wavelengths of light, chemical bond length, and the size of microscopic structures using the electron microscope.X-ray waveleng...
molecule - (physics and chemistry) the simplest structural unit of an element or compound free radical, radical - an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an ...
Atom Definition Chemistry The smallest particle of an element, which may or may not have an independent existence but always takes place in a chemical reaction is called an atom. An atom is defined as the smallest unit that retains the properties of an element. An atom is composed of sub-...
(redirected fromIon (chemistry)) Thesaurus Medical Encyclopedia i·on (ī′ŏn′, ī′ən) n. An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons. [Greekion,something that goes, neuter present participle ofienai,to go; seeei...
Home - Dictionaries - Chemistry Dictionary Definition Of Symbol Of An Atom A chemical symbol is a 1-, 2-, or 3-letter internationally agreed code for a chemical element, usually derived from the name of the element, often in Latin. More About Symbol of an atom Only the first letter is ...