relative atomic mass definition
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CONTENTS 1 The strict definition of relative atomic mass (Ar) is that it equals the average mass of all the isotopic atoms present in the element compared to 1/12th the mass of a carbon-12 atom (relative isotopic mass of 12.0000).
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mass 1. relative atomic mass - (chemistry) the mass of an atom of a chemical element expressed in atomic mass units. atomic mass, atomic weight. mass-the property of a body that causes it to have weight in a gravitational field.
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- Chapter 8. Chemical Composition. Atomic mass unit (amu) : a unit of the scale relative masses of atoms (1 amu = 1.66×10 -24 g). Atomic weight (Atomic mass) : the atomic weight of an element given in the periodic table is. a weighted average of the masses (in amu) of its isotopes found on the earth.
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mass molar mass (M) the mass of a molecule in grams (or kilograms) per mole. molecular mass the mass of a molecule in daltons, derived by addition of the component atomic masses. Its dimensionless equivalent is molecular weight. relative molecular mass technically preferable term for molecular weight.
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Isotope 1. (Chemistry) the mass of an isotope of an element in atomic mass units. 2. (Chemistry) short for relative atomic mass See atomic weight. n. the mass of an isotope of an element measured in units based on 1/12 the mass of the carbon-12 atom.
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mass (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body relativistic mass (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases
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mass (chemistry) the mass of an atom of a chemical element expressed in atomic mass units mass energy (physics) the mass of a body regarded relativistically as energy
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Atomic Mass m i = mass of isotope i. The elemental atomic mass is the atomic mass that appears in the periodic table. It is nothing more than a weighted average of the isotopic masses of all the naturally occurring isotopes.
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Relative Motion Definition of Relative Motion. Relative motion is the calculation of the motion of an object with regard to some other moving object. Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
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What is Atomic Mass? - Definition & Examples The atomic mass for an atom of hydrogen is one dalton, which is calculated from the lone proton. Remember, electrons are too small to be considered in the atomic mass. Helium is the second lightest element, and is larger than hydrogen. It consists of two protons and two neutrons. Because protons and neutrons are approximately the same size, the atomic mass of a helium atom is four daltons. Let's look at a larger atom. Barium has an atomic mass of 137 daltons.
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relative molecular mass relative molecular mass - (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule. molecular weight. mass-the property of a body that causes it to have weight in a gravitational field.
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- Definition: Relative uncertainty is a measure of the uncertainty of measurement compared to the size of the measurement. Also Known As: relative error. Examples: Three weights are measured at 1.05 g, 1.00 g, and 0.95 g. The absolute error is ± 0.05 g.
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Relative Atomic Mass Calculations Chemistry Tutorial 1 Given the relative atomic mass (r.a.m.) of an element and the mass of each of its isotopes, the relative abundance of each isotope can be calculated: 2  let y/100 = abundance of isotope 1. 3  and (100 - y)/100 = abundance of isotope 2.
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Relative atomic mass The IUPAC definition of relative atomic mass is: An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of an atom of 12 C. The definition deliberately specifies An atomic weight…, as an element will have different relative atomic masses depending on the source.
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- Relative atomic mass. Relative atomic mass (symbol: Ar) is a dimensionless (number only) physical quantity. In its modern definition, it is the ratio of the average mass of atoms of an element in a given sample to one unified atomic mass unit. The unified atomic mass unit, symbol u, is defined being 1⁄12 of the mass of a carbon-12 atom.
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atomic weight The average mass of a chemical element, expressed in atomic mass units. The atomic weight of an element having more than one principal isotope is calculated both from the atomic masses of the isotopes and from the relative abundance of each isotope in nature.
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Atomic mass As mentioned above, note that the atomic mass of an atom is not the same as its mass number. The mass number (symbol: A) of an atom is the sum of the number of protons and the number of neutrons in the nucleus. Mass numbers are always whole numbers with no units.Also, relative isotopic mass is not the same as isotopic mass, and relative atomic mass (also called atomic weight) is not the same as atomic mass.s mentioned above, note that the atomic mass of an atom is not the same as its mass number. The mass number (symbol: A) of an atom is the sum of the number of protons and the number of neutrons in the nucleus. Mass numbers are always whole numbers with no units.
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- The relative amounts of each isotope for any element represents the isotope distribution for that element. The atomic weight is the average of the isotope weights weighted for the isotope distribution and expressed on the 12 C scale as mentioned above. For a discussion of the use of weight rather than mass (preferred by physicists), see the discussion in ref. 1. The 1999 values were published in 2001 (ref.
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- Relative Atomic Mass, A r. To consider the masses of atoms measured in grams, for example, would be to deal inconveniently with extremely small numbers. Rather, the mass of an atom is compared with that of an atom of carbon-12. The relative atomic mass of carbon-12 is taken to be 12.
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Escape velocity A relative velocity is the velocity of one body with respect to another. Relative escape velocity is defined only in systems with two bodies. For systems of two bodies the term escape velocity is ambiguous, but it is usually intended to mean the barycentric escape velocity of the less massive body.
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Relative atomic mass Relative atomic mass, or atomic weight, is a dimensionless physical quantity. In its modern definition, it is the ratio of the average mass of atoms of an element to one unified atomic mass unit. The unified atomic mass unit, symbol u, is defined being 1⁄12 of the mass of a carbon-12 atom. Since both values in the ratio are expressed in the same unit, the resulting value is dimensionless; hence the value is relative. For one sample, its relative atomic mass is a straight average over the ...
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Question Bank Topic 2 Some elements have isotopes. In calculating the relative atomic mass of an element with isotopes, the relative mass and proportion of each is taken into account. For example, naturally occurring chlorine consists of atoms of relative isotopic masses 35 (75%) and 37 (25%). Its relative atomic mass is 35.5.
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Glossary of Physics Terms Relative atomic mass. The mass of an atom relative to that of carbon-12. This is approximately the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average. Atoms of the same element with different numbers of neutrons.
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- Definition of RELATIVE MOTION. 1. : motion as observed from or referred to some material system constituting a frame of reference (as two adjacent walls and floor of a room) — see relativity 3. 2. : the motion of one body with respect to another regarded as fixed — compare relative velocity.
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Atomic mass dMolecular mass (symbol m) is expressed in daltons (Da); one dalton is 1/12 of the mass of carbon 12. Molecular weight (Mr, relative molecular mass) is the ratio of the mass of a molecule to 1/12 of the mass of carbon 12 and is dimensionless. Hence, it is not correct to express Mr in daltons.
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Unified atomic mass unit Unified atomic mass unit. The unified atomic mass unit (symbol: u) or dalton (symbol: Da) is a standard unit of mass that quantifies mass on an atomic or molecular scale (atomic mass). One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol.
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Glossary of Physics Terms Relative atomic mass. The mass of an atom relative to that of carbon-12. This is approximately the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average. Isotopes. Atoms of the same element with different numbers of neutrons.