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Topic: Mass defect

	Mass Defect (Site not responding. Last check: 2007-09-27)
		The mass defect of a nucleus equals the mass of its nucleons minus its actual mass.
		C nucleus is the mass of the atom (exactly 12 amu) less the mass of the six electrons.
		Consequently, the mass of the nucleus is less than the mass of its nucleons, and the mass difference is called the mass defect,
	www.pearsoncustom.com /wertz/a_cd/caqs/html/c11_nuclear/s01_nucleus_05.html (118 words)

	Atomic mass - Wikipedia, the free encyclopedia
		The atomic mass of an element (also known as the relative atomic mass or average atomic mass or atomic weight) is the average atomic mass of all the chemical element's isotopes as found in a particular environment, weighted by isotopic abundance.
		However, since mass defect due to binding energy is minimal compared to the mass of a nucleon, rounding the atomic mass of an isotope tells you the total nucleon count.
		The pattern in the amounts the atomic masses deviate from their mass numbers is as follows: the deviation starts positive at hydrogen-1, becomes negative until a minimum is reached at iron-56, then increases to positive values in the heavy isotopes, with increasing atomic number.
	en.wikipedia.org /wiki/Atomic_mass (547 words)

	Manhattan Project: Physics: Mike Birken and Brian Sullivan (Site not responding. Last check: 2007-09-27)
		The actual mass of a nucleus is always less than the sum of the masses of the free neutrons and protons that constitute it, the difference being the mass equivalent of the energy of formation of the nucleus from its constituents.
		The conversion of mass to energy follows Einstein's equation, E = mc2, where E is the energy equivalent to a mass, m, and c is the velocity of light.
		This difference is known as the mass defect and is a measure of the total binding energy (and, hence, the stability) of the nucleus.
	www.bergen.org /AAST/manhattan_proj/projects.mp/phy_mbbs.html (1133 words)

	Atomic mass -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-27)
		No other isotope mass works out to a whole number due to the effects of nuclear (The energy required to separate particles from a molecule or atom or nucleus; equals the mass defect) binding energy.
		This is usually used as the mass in grams of one (Small velvety-furred burrowing mammal having small eyes and fossorial forefeet) mole of the element's atoms, often referred to as the (additional info and facts about gram atomic mass) gram atomic mass or (additional info and facts about molar mass) molar mass.
		For example, the atomic mass of iron is 55.847, and therefore one mole of iron atoms has a mass of 55.847 grams.
	www.absoluteastronomy.com /encyclopedia/a/at/atomic_mass.htm (416 words)

	Mass deficiency
		Mass deficiency describes the fact that the nuclei made up of protons and neutrons have a smaller rest mass than the sum of the rest masses of the protons and neutrons forming the nucleus.
		The mass difference is equal to the released binding energy.
		For the alpha particle with a mass of 4.00151 atomic mass units, the structure of two protons (1.00728 atomic mass units each) and two neutrons (1.00866 atomic mass units each), a mass defect of 0.03037 atomic mass units results.
	www.euronuclear.org /info/encyclopedia/m/massdefect.htm (102 words)

	Chemistry : Chapter 2 : Energy Calculations, Equation 1.5 (Site not responding. Last check: 2007-09-27)
		Mass defect is used as m in equation 1.5 to determine the binding energy of the nucleus.
		The mass defect is the difference between the sum of the weight of each particle in the nucleus and the actual mass of the nucleus.
		Since the actual mass is the mass of the atom, the mass of electrons must be included in the calculation of the theoretical mass.
	www.wwnorton.com /chemistry/concepts/chapter2/ch2_1.htm (556 words)

	Mass-energy equivalence - Wikipedia, the free encyclopedia
		With the concept of mass-energy equivalence, we combine together the conservation of mass and the conservation of energy, allowing mass to be converted to other forms of mass or to a form of energy, and energy to be converted to other forms of energy or a form of mass.
		Instead, the energy provided to it is converted to mass, and its relativistic mass increases, in what is known as mass dilation.
		The relativistic mass of an object is expressed as a function of its relative speed.
	en.wikipedia.org /wiki/Mass-energy_equivalence (235 words)

	Encyclopedia: Atomic mass
		Mass spectrometry is a technique for separating ions by their mass-to-charge (m/z) ratios.
		The unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses.
		The molecular mass of a substance (less accurately called molecular weight and abbreviated as MW) is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of carbon-12).
	www.nationmaster.com /encyclopedia/Atomic-mass (1132 words)

	Nuclear Chemistry
		The large mass nuclei tend to use alpha emission because it is a quick way for a large mass atom to lose a lot of nucleons.
		Mass Defect is the mass in a nucleus that is converted into energy.
		The mass defect will be the difference between the theoretical mass, calculated as the sum of the parts of the nucleus, and the experimental mass.
	www.bcpl.net /~kdrews/nuclearchem/nuclear.html (680 words)

	Hydrogen vs Helium Proton Mass
		The mass of an atom is not the sum of the masses of its individual parts.
		The mass of an atom is the sum of the masses of its parts, minus (binding energy)/c^2.
		What makes the mass of a helium nucleus less than the sum of the masses of two protons and two neutrons is that the protons are strongly bound in the helium nucleus.
	www.newton.dep.anl.gov /askasci/phy00/phy00792.htm (685 words)

	MSN Encarta - Search Results - Mass Defect
		Mass Defect, the difference between the combined masses of the individual protons and neutrons in the atom's nucleus, measured when they are...
		Our everyday experience suggests that the mass of a nucleus should be equal to the sum of the masses of the nucleons of which it is composed....
		Mass (religion), the ritual of chants, readings, prayers, and other ceremonies used in the celebration of the Eucharist in the Roman Catholic Church....
	uk.encarta.msn.com /Mass_Defect.html (105 words)

	Mass Defect (Site not responding. Last check: 2007-09-27)
		Actually, the mass of a proton is 1.00728 amu; a neutron is 1.00866 amu.
		The mass of 6 protons and 6 neutrons is 12.0956 amu, to be precise--but the mass of a carbon nucleus is less than the sum of its parts.
		In the section on nuclear physics, I'll discuss the explanation and the consequences of the mysterious missing mass.
	www.colorado.edu /physics/2000/periodic_table/amu.html (115 words)

	M
		It is called the mass defect because, by this amount, the mass of the component object is less than the sum of the masses of its parts.
		While mass is surely one of the most basic properties of an astronomical object, it is not that easy to actually determine that mass.
		Thirdly, mass and momentum are conserved quantities - their total sum is the same whenever particles interact (this is equivalent to a slightly modified version of the "action equals reaction" principle of classical mechanics).
	www.einstein-online.info /en/navMeta/dictionary/m/index.html (1720 words)

	The Nucleus: Nucleus and Radioactivity: Plus 2 Physics (Site not responding. Last check: 2007-09-27)
		The difference between the nucleon mass and the nuclear mass is called the mass defect.
		This mass defect is a measure of the binding energy of the nucleus.
		The atomic mass unit (amu) is a conveniently small unit for measuring masses of subatomic particles.
	www.plus2physics.com /nucleus_and_radioactivity/study_material.asp?chapter=1&page=4 (468 words)

	University of Florida - Department of Physics :: PHY2005 Applied Physics 2 :: Solutions Ch 31
		The mass defect is found by calculating the difference between the total mass of the separate nucleons and the mass of the combined nucleons to form the atom.
		Nuclear mass implies the former; atomic mass implies the latter.
		Since the mass of C-12 is less than the sum of the masses of Be-8 and He-4, the reaction is forbidden by the energetics.
	www.phys.ufl.edu /courses/phy2005/solutions/ch31.html (1114 words)

	Detection and characterization of metabolites in biological matrices using mass defect filtering of liquid ...
		Detection and characterization of metabolites in biological matrices using mass defect filtering of liquid chromatography/high resolution mass spectrometry data.
		An improved mass defect filter (MDF) method employing both drug and core structure filter templates was applied to the processing of high resolution liquid chromatography/mass spectrometry (LC/MS) data for the detection and structural characterization of oxidative metabolites with mass defects similar to or significantly different from those of the parent drugs.
		The unprocessed mass chromatogram showed no distinct indication of metabolite peaks; however, after MDF processing, the metabolite peaks were easily identified in the chromatogram.
	counsellingresource.com /medications-research/2006/07/05/detection-and-characterization-of-metabolites-in-biological-matrices-using-mass-defect-filtering-of-liquid-chromatographyhigh-resolution-mass-spectrometry-data (463 words)

	Mass Spectrometry
		Average Mass: the sum of the average of the isotopic masses of the atoms in a molecule.
		Mass of the proton is therefore 1.0072; mass of the hydrogen atom is 1.0078
		Tandem Mass Spectrometry: a sophisticated form of mass analysis whereby ions separated according to their m/z value in the first stage analyzer are selected for fragmentation and the fragments analyzed in a second analyzer.
	www.cco.caltech.edu /~ppmal/sample_prep/term_def.html (1718 words)

	Inertia & Magnetisim
		The ordinate of the average mass defect curve is obtained by taking the total mass loss of the isotope and dividing that by the total number of nucleons.
		Mass is a measure of force due to the mutual interaction between a quantity of matter and the prime radiant sea, it is not a measure of the quantity of matter.
		The gravitational mass of the sun is determined by the period and radius of the planets orbits.
	home.netcom.com /~sbyers11/inertia.htm (3993 words)

	Foundations to Chemistry - adapted from "Chemistry, Matter and the Universe"
		With nuclear reactions, the energies involved are so great that the changes in mass become easily measurable.
		The answer, as we mentioned in Chapter 2, is that a helium atom is lighter than the sum of two protons, two neutrons, and two electrons.
		Some of the mass of the separated particles is converted into energy and dissipated when the nucleus is formed.
	www.chem.ox.ac.uk /vrchemistry/Conservation/page21.htm (215 words)

	..:Physics 30 - {Unit IV - Nuclear Physics - LessonIV_2_1}:.. (Site not responding. Last check: 2007-09-27)
		Mass is not conserved in a nuclear reaction.
		This nuclear mass defect can be used to determine the nuclear binding energy which held the heavier nucleus together and was released during fission.
		A mass grater than the critical mass is needed to produce a sustainable nuclear chain reaction.
	www.saskschools.ca /curr_content/physics30/nuke/lessoniv_2_1.html (458 words)

	Mass Defect (Site not responding. Last check: 2007-09-27)
		The mass defect corresponds to the atom having a lower energy than its component particles
		The energy corresponding to the mass defect is called the nuclear binding energy
		The Einstein equation is used to determine the mass-energy equivalence:
	www.public.asu.edu /~jpbirk/CHM-115_BLB/Chpt21/sld055.htm (38 words)

	MASS DEFECT AND MASS
		The difference between the sum of the masses of the protons and neutrons and the actual mass of the nucleus is called the mass defect.
		The mass defect is substituted into the Einstein equation, and the value of the energy change is calculated.
		The result of this equation is that if the mass of a nucleus is always less than the sum of the masses of free protons and neutrons, then the energy of the nucleus should be less than the sum of the energies of the protons and neutrons.
	www.chemdiscovery.com /chemcd/Q2/2res07c.htm (259 words)

	lecture_13.0
		The mass of these building blocks as individuals that are added together is greater than the actual mass of the nucleus (or the atom).
		Since the energy represented by the mass defect equals the binding energy of the nucleus, we can compute it by using E binding = (mass defect) C^2.
		We know that the energy represented by the mass defect equals the binding energy of the nucleus, which we can compute using E binding = (mass defect) C^2.
	www.pcs.cnu.edu /~gwebb/4Lecture12_nuclear2.htm (722 words)

	Usenet Archive
		A dimension of mass is not equal to a unit of energy, and a nuclear reaction is between protons, neutrons, electrons, neutrinos and photons.
		Also, the so-called mass defect, which is supposed to represent missing mass (and thus a conversion to energy within the atom) is calculated by a system designed to give a false impression of mass to energy conversion.
		If you disregard the atomic mass unit, which has no basis in reality but is an arbitrary value chosen from the average total mass of carbon 12, (it used to be oxygen 16, but was later changed), you would find that stable lithium actually has a negative "mass defect".
	www2.usenetarchive.org /Dir68/File824.html (11518 words)

	Chemistry Review
		If you check atomic masses in the periodic system you will find quite often that the value is higher than you would have expected from the sum of proton -, neutron-, and electron - masses minus mass defect.
		For example chlorine has 17 protons and assuming that there are 18 neutrons, the atomic mass of chlorine should be approximately 35 amu (you could calculate the exact expected value, neglecting the mass defect or mass loss caused by the formation of the nucleus) However, the actual atomic mass of chlorine is 35.4527 amu.
		The atomic mass or atomic weight - as it is more frequently called - of an atom is the average mass of the mixture of isotopes that reflects the masses and relative abundance of the elements as they occur in nature.
	www.prism.gatech.edu /~gh19/b1510/chemrev.htm (3640 words)

	binding energy – (symbol: EB) the energy equivalent to the mass defect when nucleons bind together to form an atomic ... (Site not responding. Last check: 2007-09-27)
		Therefore the energy of the nucleus consists of the energy equivalent of the mass of individual nucleons minus the binding energy.
		The binding energy per nucleon plotted against the mass number provides a useful graph showing that up to a mass number of 50 – 60 (iron, nickel, etc.), the binding energy per nucleon increases rapidly, thereafter it falls slowly.
		Energy is released both by fission of heavy elements and by fusion of light elements because both processes entail a rearrangement of nuclei in the lower part of the graph to form nuclei in the higher part of the graph..
	www.yphysics.freenet.kz /Words%20B/binding%20energy.htm (159 words)

	EAS Mass Excess
		That is, if we want to know the masses of specific nuclei or of electrons, we subject them to known electrical and/or magnetic fields and by observing their trajectories or their changes in velocity we calculate or deduce their masses.
		Since neutrons are electrically neutral we "measure" the masses of differing isotopes of an atom, then deduce neutron masses based on the differences and energy input/output considerations.
		The mass of a deuteron is less than the combined masses of two protons and an electron, or of a proton plus a neutron.
	www.ebicom.net /~rsf1/mass-xcs.htm (1098 words)

	V
		Lange then blames what he believes to be the widely-held but errant view that mass has in this case changed into energy upon failing to distinguish the perspective of the mass-equivalence of the predecay and decay systems from the perspective of the mass-asymmetry of the predecay and decay bodies (of the systems).
		He argues for that possibility with his principle that ‘[m]ass is not additive’ [Lange 237], according to which mass wholes need not be equal to the sum of the masses of their constituents, the difference residing in kinetic energy associated with their constituents in a zero-sum momentum frame [Lange 229-30].
		Hence, for Lange mass is, of course, attributable to the predecay nucleus as a single body, which is also a spatiotemporal system.
	www.uwmanitowoc.uwc.edu /staff/awhite/AL.4.htm (1869 words)

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