what is the definition of atom
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What is An Atom? - Definition & Examples An atom is the basic unit of a chemical element. Everything in the world is made out of atoms. Your computer monitor is made out of atoms. The desk it sits on is made out of atoms. So is the air you're breathing. In fact, you are also made out of atoms.
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atom atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element. substance - the real physical matter of which a person or thing consists; DNA is the substance of our genes.
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- Full Definition of MOLECULE. 1. : the smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms. 2.: a tiny bit: particle.See molecule defined for English-language learners.See molecule defined for kids. ADVERTISEMENT. the smallest possible amount of a particular substance that has all the characteristics of that substance. : a very small amount of something.
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Definition of Element Definition of Element. 1) A substance that cannot be decomposed into simpler substances by chemical means. 2) One of the 116 presently known substances that cannot be decomposed by chemical reaction into a simpler substance. Elements comprise all matter at and above the atomic level.
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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.
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What is An Atom? - Definition & Examples Most of the atom is empty space-both the nucleus and the electrons are so tiny that even solid objects are mostly empty. Protons are stable subatomic particles, with a positive +1 charge and a mass of approximately one atomic mass unit.
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Definition of Element Definition of Element What is an Element? An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions. 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.
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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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- An ion (/ˈaɪən, -ɒn/)[1] is an atom, or a molecule, in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge. An atom, or molecule, with a net positive charge is a cation.
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Atom Definition and Examples Weegy: An atom is the defining structure of an element, which cannot be broken by any chemical means. [ A typical atom consists of a nucleus of protons and neutrons with electrons orbiting this nucleus.. ] (More) Question.
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- The word atom comes from the Greek word of Indivisible, so it means unable to be divided. EN The word atom comes from the two Greek affixes, a-tom; a is the privativ…e affix meaning deprivation; tom comes from the Greek temno (τέμνω) meaning slit, slash, cut.
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Molecule A molecule is a particle containing two or more atoms. If it contains only one type of atom it is called an element.
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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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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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ion n. An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons. [Greek. , something that goes, neuter present participle of. , to go; see ei-in Indo-European roots .].
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Molecule A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term molecule is often used less strictly, also being applied to polyatomic ions. In the kinetic theory of gases, the term molecule is often used for any gaseous particle regardless of its composition. According to this definition, noble gas atoms are considered molecules as they are in fact monoatomic molecules.
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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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atom The smallest unit of an element, consisting of at least one proton and (for all elements except hydrogen) one or more neutrons in a dense central nucleus, surrounded by one or more shells of electrons. In electrically neutral atoms, the number of protons equals the number of electrons.
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- Lipoatrophy can be associated with nephritis, hypocomplementemia, scleroderma, Sjögren syndrome, recurrent pyogenic infections, immune thrombocytopenic purpura (ITP), and thyroiditis. [4, 5] The etiology of lipodystrophy is believed to be either inflammatory or noninflammatory.
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electron Definition of electron. : an elementary particle consisting of a charge of negative electricity equal to about 1.602 × 10−19 coulomb and having a mass when at rest of about 9.109 × 10−31 kilogram or about 1⁄1836 that of a proton.
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atomic a·tom·ic. adj. 1. Of or relating to an atom or atoms. 2. Of or employing nuclear energy: an atomic submarine; atomic weapons. 3. Very small; infinitesimal. a·tom′i·cal·ly adv.
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Atomic number Atomic number. The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom. It is identical to the charge number of the nucleus. The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons.
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Glossary 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 (such as a free electron)
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Chemistry Atoms are the smallest particles of matter that can enter into chemical reactions. Elements are composed of atoms. Molecules are the smallest particles of matter that can have independent existence. Molecules can contain one atom, two atoms, or more than two atoms. Atomic number is the number of protons in the nucleus of an atom of an element. Mass number is the sum of the protons and the neutrons in the nucleus of an atom of an element.
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Ion An ion is an electrically charged atom or group of atoms. It is a part of an atom, or part of a group of atoms (molecule). It is  charged  so it will move near electricity. This is because atoms are made of three smaller parts (1) neutrons (with no charge), and equal numbers of (2) charged protons and (3) oppositely-charged electrons. An ion has unequal numbers of protons and electrons. Making an ion from an atom or molecule is called ionization. The charge on a proton is measured as +1 (positively charged), and the charge on an electron is measured as -1 (negatively charged).