definition of atoms
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atom at·om. The smallest unit of an element, consisting of protons and neutrons in a dense central nucleus orbited by a number of electrons. In electrically neutral atoms, the number of protons equals the number of electrons.
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atom atom. n. 1. (Atomic Physics). a. the smallest quantity of an element that can take part in a chemical reaction. b. this entity as a source of nuclear energy: the power of the atom.
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- 1 An atom is the smallest indivisible particle of an element which can take part in a chemical change. 2  Atoms can neither be created nor destroyed in a chemical reaction. 3  Atoms of the same element are identical in all respects, having the same size, shape and structure, and especially mass.
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Ion Definition Ion Definition An ion is defined as an atom or molecule which has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge. In other words, there is an imbalance in the number of protons (positively charged particles) and electrons (negatively charged particles) in a chemical species.
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- Share. Electron Definition: An electron is a negatively charged component of an atom. Electrons exist outside of and surrounding the atom nucleus. Each electron carries one unit of negative charge and has a very small mass as compared with that of a neutron or proton.By Anne Marie Helmenstine, Ph.D.lectron Definition: An electron is a negatively charged component of an atom. Electrons exist outside of and surrounding the atom nucleus.
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- Definition of ion. 1  1 : an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons. 2  2 : a charged subatomic particle (as a free electron)
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atom A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.
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What is the difference between an atom, a cell and a molecule? A slight improvement over Kieran's definition of 'atom': it is the smallest possible piece of any of the elements of chemistry. That is, the smallest possible piece of hydrogen is a hydrogen atom, although in practice you will find the hydrogen molecule much more often in nature. But both hydrogen atoms and hydrogen molecules are the same element, hydrogen.
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molecule A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atom s that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electron s among atoms. The atoms of certain elements readily bond with other atoms to form molecules. Examples of such elements are oxygen and chlorine. The atoms of some elements do not easily bond with other atoms. Examples are neon and argon. Molecules can vary greatly in size and complexity. The element helium is a one-atom molecule. Some molecules consist of two atoms of the same element. For example, O 2 is the oxygen molecule most commonly found in the earth's atmosphere; it has two atoms of oxygen.
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Definition of Element Definition of Element. An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods. Although an element's atoms must all have the same number of protons, they can have different numbers of neutrons and hence different masses. When atoms of the same element have different numbers of neutrons, they are called isotopes.
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Chapter 3 Molecules and Atoms Chapter Review Chapter 3 Molecules and Atoms Chapter Review. 1. Define isotope. A. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
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element In chemistry, a pure substance consisting of only one type of atom. Further breakdown by nonchemical means of an element results in subatomic particles (protons, neutrons and electrons), which are indistinguishable from those from other elements.
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compound compound. in chemistry, a substance composed of atoms atom[Gr.,=uncuttable (indivisible)], basic unit of matter; more properly, the smallest unit of a chemical element having the properties of that element.
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molecule A molecule is composed of two or more atoms that are covalently bonded. See also atom, compound. The smallest unit of a substance that can exist alone and retain its core chemical and physical characteristics.olecule, n a unit of matter that is the smallest particle of an element or chemical combination of atoms (as a compound) capable of retaining chemical identity with the substance in mass.
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atom b. this entity as a source of nuclear energy: the power of the atom. See also atomic structure. 2. any entity regarded as the indivisible building block of a theory. 3. (Philosophy) the hypothetical indivisible particle of matter postulated by certain ancient philosophers as the fundamental constituent of matter. See also atomism. 4. a very small amount or quantity; minute fragment: to smash something to atoms; there is not an atom of truth in his allegations.
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atom atom. 1  Physics. 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 number of protons determines the identity of the element. 2  Energy.
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compound 1 A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule. The elements cannot be separated by physical means. Water, for example, is a compound having two hydrogen atoms and one oxygen atom per molecule.
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What is an Atom? The term atom comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided. We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles such as quarks.
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- Definition of ATOMISM. 1. : a doctrine that the physical or physical and mental universe is composed of simple indivisible minute particles. 2. : individualism 1. — at·om·ist \-mist\ noun.
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ATOMS Atoms of elements (and ion forms) make up molecules, which can  combine with other atoms and molecules to form compounds. To be  more scientific:   An atom is the smalle … st component of any element having all the  chemical properties of that specific element.toms of elements (and ion forms) make up molecules, which can  combine with other atoms and molecules to form compounds. To be  more scientific:   An atom is the smalle … st component of any element having all the  chemical properties of that specific element.
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- A molecule is a particle containing two or more atoms. If it contains only one type of atom it is called an element. An exception to this is diatomic gases (for example: Oxygen, O 2, where the molecule contains two atoms of the same element, bonded covalently.
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compound 1 (kŏm'pound') A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule. The elements cannot be separated by physical means. Water, for example, is a compound having two hydrogen atoms and one oxygen atom per molecule.
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General Chemistry/Atoms and Molecules General Chemistry/Atoms and Molecules - Atoms. 1  An atom is the smallest unit of matter that has the properties of an element. 2  The nucleus, composed of protons and neutrons, is at the center of an atom. 3  The electron has an electric charge equal but opposite the proton (that is, they cancel).
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SEP-IRA SEP contribution limits are computed not from net profit but from net profit adjusted for the deduction for self-employment tax (2006 Form 1040, line 27, from Schedule SE, Section A, line 6, or Section B, line 13). Barring limits, this is half the 15.3% FICA tax, levied on net earnings, which is 92.35% of net profit.
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Atoms, Molecules, Elements, Compounds Atoms are the building blocks of everything you see around: the screen you are looking at, your study table, your books, etc. Such is the amazing power of nature and fundamental nature of these particles.
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Elements and Atoms: The Building Blocks of Matter An element is a substance made from only one type of atom. Remember this definition as you might need it in the exam! For example Carbon is made entirely from carbon atoms. Sodium is made entirely from sodium atoms. Unlike a compound, an element cannot be broken down (chemically) into a more simple substance. The periodic table shows all the elements. Atoms of the same element have the same number of protons and therefore have the same atomic number.
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- Atom Definition. Chemistry Glossary Definition of Atom. This is a basic diagram of an atom, with protons, neutrons and electrons labeled. AhmadSherif, Wikipedia Commons. Anne Marie Helmenstine, Ph.D.