An atom is the defining structure of anelement, which cannot be broken by any chemical means. Atypical atomconsists of a nucleus of positively-chargedprotonsand electrically neutralneutronswith negatively-chargedelectronsorbiting this nucleus. However, an atom can consist of a single proton (i.e., ...
Theatomicnumberof an element is the number of free protons (those not in neutrons) in the nucleus; it is equal to the net positive charge of the nucleus. Theatomicweightis the weight of an atom of a substance as compared with the weight of an atom of carbon-12, which is taken as 12...
An atom is the basic unit of an element. When you see the chemical formula for water, H2O, it's telling you that each molecule of water is made up of two atoms of hydrogen and one atom of oxygen.
The meaning of ATOM is the smallest particle of an element that can exist either alone or in combination. How to use atom in a sentence. Did you know?
Kids Definition atom noun at·omˈat-əm 1 :a tiny particle:bit 2 :the smallest particle of an element that has the properties of the element and can exist either alone or in combination 3 :the atom considered as a source of vast potential energy ...
Atom definition: the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the numb
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-...
Modern atomic theory begins with the work of John Dalton, published in 1808. He held that all the atoms of an element are of exactly the same size and weight (seeatomic weight) and are in these two respects unlike the atoms of any other element. He stated that atoms of the elements un...
The atom definition is the smallest unit of matter that still holds the properties of an element. Matter is anything that has mass and takes up space. Elements are types of matter that have specific chemical and physical properties and cannot be broken down into other substances. Atoms are the...
Dictionary definitions of the word atom The meaning of atom atom 2 definitions of the word atom. Noun (physics and chemistry) the smallest component of an element having the chemical properties of the element (nontechnical usage) a tiny piece of anything ...