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Topic: Mass number

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	ChemTeam: Nuclear Symbol (Site not responding. Last check: 2007-11-04)
		The number of protons in the nucleus of the atom.
		The number of protons and neutrons in the nucleus of the atom.
		The 22 is the atomic number for titanium and 48 is its mass number.
	dbhs.wvusd.k12.ca.us /webdocs/AtomicStructure/Nuclear-Symbol.html (233 words)

	Mass number - Wikipedia, the free encyclopedia
		The mass number (A), also called atomic mass number or nucleon number, is the number of protons plus the number of neutrons in an atomic nucleus.
		The mass number is unique for each isotope of an element and is written either after the element name or as a superscript to the left of an element's symbol.
		Thus the atomic number decreases by 1 (Z:7->6) and the mass number remains the same (A = 14), however the number of neutrons increases by 1.
	en.wikipedia.org /wiki/Mass_number (231 words)

	Atomic number - Wikipedia, the free encyclopedia
		In chemistry and physics, the atomic number (Z) is the number of protons found in the nucleus of an atom.
		It was later shown that the atomic number corresponds to the electric charge of the nucleus — in other words the number of protons.
		The atomic number is closely related to the mass number (although they should not be confused) which is the number of protons and neutrons in the nucleus of an atom.
	en.wikipedia.org /wiki/Atomic_number (305 words)

	AllRefer.com - mass number (Chemistry) - Encyclopedia
		mass number, often represented by the symbol A, the total number of nucleons (neutrons and protons) in the nucleus of an atom.
		All atoms of a chemical element have the same atomic number (number of protons in the nucleus) but may have different mass numbers (from having different numbers of neutrons in the nucleus).
		Different isotopes of the same element cannot have the same mass number, but isotopes of different elements often do have the same mass number, e.g., carbon-14 (6 protons and 8 neutrons) and nitrogen-14 (7 protons and 7 neutrons).
	reference.allrefer.com /encyclopedia/M/massnumb.html (210 words)

	Mass Spectrometry
		A mass spectrum will usually be presented as a vertical bar graph, in which each bar represents an ion having a specific mass-to-charge ratio (m/z) and the length of the bar indicates the relative abundance of the ion.
		The masses of molecular and fragment ions also reflect the electron count, depending on the number of nitrogen atoms in the species.
		The mass calculator on the right may be used to calculate the exact mass of a molecule based on its elemental composition.
	www.cem.msu.edu /~reusch/VirtualText/Spectrpy/MassSpec/masspec1.htm#ms1 (2839 words)

	How do I find the number of protons, electrons and neutrons that are in an atom of...?
		The atomic number is the number of protons in an atom of an element.
		The atomic number (36) is the number of protons in krypton.
		That is the number of neutrons in an atom of krypton.
	education.jlab.org /qa/pen_number.html (840 words)

	Chemistry : Chapter 1 : Atomic Structure (Site not responding. Last check: 2007-11-04)
		However, the mass number, which is the sum of the protons and neutrons, is included as a superscript before the chemical symbol.
		A reasonable guess for the mass number of the most abundant isotope is to round the average atomic mass to the nearest whole number.
		E, where A is the mass number and E is the symbol of the element, the number of protons and the number of electrons are equal to the atomic number, Z, and the number of neutrons is A –; Z.
	www.wwnorton.com /chemistry/concepts/chapter1/ch1_2.htm (614 words)

	Glencoe Online Science Quiz Chapter
		The mass of a proton is measured in __________.
		The atomic number of manganese is 25; its mass number is 55.
		The __________ of an element is the number of __________ of an atom of that element.
	www.glencoe.com /qe/science.php?qi=338 (260 words)

	Atomic Number and Mass Number
		Define and determine the mass number of an atom.
		The number of protons in the nucleus of an atom determines an element's atomic number.
		The atomic number of an element never changes, meaning that the number of protons in the nucleus of every atom in an element is always the same.
	www.ndt-ed.org /EducationResources/HighSchool/Radiography/atomicmassnumber.htm (191 words)

	Mass Layoffs Summary
		On a not seasonally adjusted basis, the number of layoff events in February 2006, at 719, was down by 91 from a year earlier, and the number of associated initial claims decreased by 8,089 to 66,555.
		Geographic Distribution (Not Seasonally Adjusted) Among the four census regions, the highest number of initial claims in February due to mass layoffs was in the West, 22,740.
		Six of the nine geographic divisions had over-the-year decreases in the number of initial claims as- sociated with mass layoffs, with the largest in the Pacific division (-7,717).
	www.bls.gov /news.release/mmls.nr0.htm (1014 words)

	mass number on Encyclopedia.com (Site not responding. Last check: 2007-11-04)
		MASS NUMBER [mass number] often represented by the symbol A, the total number of nucleons (neutrons and protons) in the nucleus of an atom.
		Number of mass layoffs at U.S. firms rises in Sept
		The number of marchers was estimated between 750,000 to 2,000,000.
	www.encyclopedia.com /html/m1/massnumb.asp (1011 words)

	Mass Spectrometry
		Monoisotopic Mass: the sum of the exact or accurate masses of the lightest stable isotope of the atoms in a molecule.
		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
	www.cco.caltech.edu /~ppmal/sample_prep/term_def.html (1718 words)

	Atomic Theory (Site not responding. Last check: 2007-11-04)
		The Atomic Mass of an atom is the total number of protons and neutrons which are present in the nucleus of the atom.
		The Atomic Mass Number of an atom is the total number of protons and neutrons in the nucleus of the atom.
		The Atomic Number of an element is the number of protons or positive charges which are present in the nucleus of the atoms of that element.
	www.ucc.ie /ucc/depts/chem/dolchem/html/dict/atom.html (1217 words)

	Handout on writing and balancing nuclear equations
		If the mass number and atomic numbers of the particles emitted from a nucleus are known, the product nucleus can be identified by balancing mass numbers and atomic numbers in the nuclear equation.
		Identify the type of particle emitted by the decay and write the nuclear equation, with the mass number and the atomic number of the daughter nucleus written as A and Z, respectively.
		STRATEGY The total number of nucleons (mass number) and total charge must be the same on each side of the equation to determine the identity of the isotope required to balance the equation.
	asstudents.unco.edu /students/Chem108de/hand_nuc.htm (350 words)

	Nuclear Chemistry
		It is a graph that plots the Binding Energy per Nucleon as a vertical coordinate and the Mass Number of the elements as the horizontal coordinate.
		The graph peaks at a mass number of 56.
		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)

	stochiometry
		The mass of an atom is measured in the atomic mass units (amu).
		- The mass of a mole of a substance.
		Since the molar mass equals the atomic weight, the mass values found on the periodic table are also the molar masses of the elements.
	www.chem.tamu.edu /class/majors/tutorialnotefiles/stochiometry.htm (347 words)

	Some Defs (Site not responding. Last check: 2007-11-04)
		The neutron number, N, is the number of neutrons in the nucleus, which is obviously equal to A — Z.
		The reason that we can get away with calling a pure number like the number of nucleons a mass number is that, if we multiply the atomic mass by a unit called the atomic mass unit, denoted u, then we get a good approximation for the mass of the given nucleus.
		The mass number A also gives us a measure of the molar atomic mass in the sense that the atomic mass is numerically equal to the mass in grams of Avogadro’s number of those nuclei.
	physics.mtsu.edu /~phys2020/Lectures/L6-L11/L10/Some_Defs/some_defs.html (431 words)

	Atomic Mass
		determine the number of neutrons in an element given the atomic mass and the number of electrons.
		It may also be difficult for them to that when we determine the mass number for an element, we only count the numbers of protons and neutrons (since the mass of an electron is so much smaller than that of a proton or neutron).
		Multiply the number of each particle by the mass of one of those particles and record that answer in the data table.
	galileo.phys.virginia.edu /education/outreach/8thgradesol/AtomicMass.htm (839 words)

	Nuclear Units
		Nuclear masses are measured in terms of atomic mass units with the carbon-12 nucleus defined as having a mass of exactly 12 amu.
		The number of protons is called the atomic number and determines the chemical element.
		Nuclei of a given element (same atomic number) may have different numbers of neutrons and are then said to be different isotopes of the element.
	hyperphysics.phy-astr.gsu.edu /hbase/nuclear/nucuni.html (416 words)

	Lesson 3-5 Elemental Notation and Isotopes
		The atomic number represents the number of protons in the atom's nucleus, and it is this number that determines the identity of the element.
		The mass number, which is given the symbol "A", is located in the upper left-hand corner.
		Not all carbon atoms have a mass number of 12.
	www.fordhamprep.com /gcurran/sho/sho/lessons/lesson35.htm (570 words)

	nucleus, in physics: The Nature of the Nucleus
		The total number of protons and neutrons together in a nucleus is the atomic mass number of the nucleus.
		When nuclear masses are measured, the mass is always found to be less than the sum of the masses of the individual nucleons bound in the nucleus.
		The difference between the nuclear mass and the sum of the individual masses is known as the mass defect and is due to the fact that some of the mass must be converted to energy in order to make the nucleus stable.
	www.factmonster.com /ce6/sci/A0860076.html (559 words)

	Boston.com / News / Local / Mass. / Cellphone number portability era begins
		Finally liberated from the hassle of having to alert family, friends, and business associates they have a new cellphone number, millions of wireless consumers across the country are expected to switch carriers, starting this morning.
		And because the policy also requires carriers to let someone move a home or office landline number to wireless service, it could also accelerate the social revolution of Americans using a cellphone as their sole phone -- something about 6 million to 8 million, many of them college students and mobile young adults, already do.
		Number portability will be available in the rest of the country May 24.
	www.boston.com /news/local/massachusetts/articles/2003/11/24/cellphone_number_portability_era_begins (897 words)

	Ideal Gas Law
		A convenient standard quantity is the mole, the mass of gas in grams equal to the molecular mass in amu.
		A mole (abbreviated mol) of a pure substance is a mass of the material in grams that is numerically equal to the molecular mass in atomic mass units (amu).
		For an isotope of a pure element, the mass number A is approximately equal to the mass in amu.
	hyperphysics.phy-astr.gsu.edu /hbase/kinetic/idegas.html (1049 words)

	Atomic Number and Mass Number (Site not responding. Last check: 2007-11-04)
		An atom's atomic number is the number of protons there are in the nucleus.
		The mass number is the number of neutrons added to the number of protons.
		The mass number of the most common isotope can be obtained from the periodic table.
	www.cartage.org.lb /en/themes/Sciences/Physics/Atomicphysics/Atomictheory/AtomicNumber/AtomicNumber.htm (260 words)

	mass number -- Encyclopædia Britannica
		The mass number is commonly cited in distinguishing among the isotopes of an element, all of which have the same atomic number (number of protons) and are represented by the same literal symbol; for example, the two best known isotopes of uranium (those with mass numbers…
		Mass communication messages are prepared by groups of people working for an organization, be they a staff working for a newspaper or a group of...
		In converting older laws of nature to relativistic terms, Einstein found it necessary to treat mass (matter) and energy as potentially interchangeable, according to the law E = mc2, in which E is the energy of matter with mass m and c is the speed of light.
	www.britannica.com /eb/article-9051289 (609 words)

	Atoms and Molecules (Site not responding. Last check: 2007-11-04)
		The number of neutrons is approximately equal to the number of protons for stable light nuclei, and is about 1-2 times the number of protons for the heavier stable nuclei.
		Atoms having the same number of protons (and therefore the same number of electrons) but different numbers of neutrons are called isotopes of the element in question.
		Here is a periodic table of the elements which gives the atomic number and symbol for all elements, and the name and basic chemical properties for each of these elements if you click on the element's symbol in the resulting table.
	csep10.phys.utk.edu /astr162/lect/light/atoms.html (361 words)

	Avogadro's Number (Site not responding. Last check: 2007-11-04)
		Mass out one g-relative weight of each of the three substances and fill in line four of the chart by counting the number of "atoms" present.
		Prior to this exercise I have extensively discussed with my students the difference between atomic mass number, atomic number, actual atomic mass, and the atomic weight (or atomic mass) of the elements.
		I have found that the error is reduced by finding the average of 10 or 20 items of each object and using this as the actual mass in line one of the chart.
	chem.lapeer.org /Chem1Docs/MolExercise.html (542 words)

	Chemistry : Chapter 2 : Writing Nuclear Equations (Site not responding. Last check: 2007-11-04)
		Balancing nuclear equations requires that the sum of the mass numbers be the same on each side of the equation.
		It is normally easier to figure out the missing pieces in atomic number and mass number and then match the symbol to the atomic number.
		Since 90 is the atomic number for thorium, the symbol Th is used.
	www.wwnorton.com /chemistry/concepts/chapter2/ch2_2.htm (463 words)

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