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Topic: Atomic weight

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Atomic mass

Atomic mass unit

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Molecular weight

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	Kids.Net.Au - Encyclopedia > Atomic weight
		The atomic weight (or, more accurately, the atomic mass) of an isotope of a chemical element is the mass of one atom of that isotope, expressed in units (atomic mass unit, amu) such that the Carbon-12 isotope receives atomic weight 12.
		The atomic weight of a chemical element is defined as the average atomic weight of its isotopes.
		For example, the atomic weight of iron is 55.847, and therefore one mole of iron atoms weighs 55.847 grams.
	www.kids.net.au /encyclopedia-wiki/at/Atomic_weight (267 words)

	atomic weight - Encyclopedia.com
		atomic weight mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope.
		Although the first atomic weights were calculated at the beginning of the 19th cent., it was not until the discovery of isotopes by F. Soddy (c.1913) that the atomic mass of many individual isotopes was determined, leading eventually to the adoption of the atomic mass unit as the standard unit of atomic weight.
		The atomic mass and relative abundance of the isotopes of an element can be measured very accurately and with relative ease by this method, whereas chemical determination of the atomic weight of an element requires a careful and precise quantitative analysis of as many of its compounds as possible.
	www.encyclopedia.com /doc.aspx?id=1E1:atomicwe (1671 words)

	Atomic Weight - Succeed in Physical Science: School for Champions
		The new definition of an atomic mass unit is that it is 1/12 of the atomic weight of Carbon-12.
		The atomic weight or mass of an element is approximately the sum of the number of protons and neutrons in the nucleus.
		This value is not a whole number because the atomic weights of the proton and neutron are not exactly 1, the additional effect of energy-mass factor of fission and fusion reactions, and the averaging of the weights of isotopes.
	www.school-for-champions.com /science/atomic_weight.htm (1116 words)

	Chemistry: WebElements Periodic Table : Periodic properties : Standard atomic weights (IUPAC 1997): Definition
		The atomic weight is the average of the isotope weights weighted for the isotope distribution and expressed on the
		The table below of atomic weights is adapted from the 1997 report of the IUPAC Atomic Weights and Isotopic Abundances Commission entitled "Atomic Weights of the Elements 1997" (ref 3).
		The difference between the atomic weight of the element in such specimens and that given in the table may exceed the stated uncertainty.
	www.webelements.com /webelements/properties/text/definitions/atomic-weight.html (678 words)

	Relative Atomic Weight
		The purpose of this experiment is to calculate the percentage composition of a compound and from this determine the relative atomic weight of the unknown element in the compound.
		Determine the relative weight of M. (Assume the atomic weight of oxygen is 16.00.) Make sure your answer has the correct number of significant digits for your data.
		The atomic weight of M is not really an an element but either KCl or NaCl, but students need not know this.
	chem.lapeer.org /Chem1Docs/RelAtWt.html (531 words)

	Bambooweb: Atomic weight
		The atomic weight is the sum of neutrons and protons in the nucleus of the atom.
		In reference to a certain chemical element, atomic weight (also called mean relative atomic mass, average atomic weight, atomic mass, or average atomic mass) is the average atomic weight of the chemical element's isotopes.
		Although the term atomic weight is being phased out slowly and being replaced by relative atomic mass, in much current usage - particularly in the form standard atomic weight (as used by IUPAC at this time) - atomic weight is used to refer to the mean relative atomic mass of an element.
	www.bambooweb.com /articles/a/t/Atomic_weight.html (402 words)

	atomic weight. The Columbia Encyclopedia, Sixth Edition. 2001-05
		mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope.
		Atomic weights were formerly determined directly by chemical means; now a mass spectrograph is usually employed.
		The atomic mass and relative abundance of the isotopes of an element can be measured very accurately and with relative ease by this method, whereas chemical determination of the atomic weight of an element requires a careful and precise quantitative analysis of as many of its compounds as possible.
	www.bartleby.com /65/at/atomicwe.html (681 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.
		The atomic mass of an isotope is the relative mass of the isotope, scaled with carbon-12 as exactly 12.
		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_weight (547 words)

	Weight - Wikipedia, the free encyclopedia
		Under most circumstances, this ambiguity is not a problem, because the weight of an object is directly proportional to its mass, and the constant of proportionality -- the strength of the gravitational field -- is approximately constant everywhere on the surface of the Earth (around 9.8 m/s²).
		Although terms such as "atomic weight", "molecular weight", and "formula weight" may still be encountered, such usage is often discouraged; terms like atomic mass are used instead.
		The weight force that we sense is actually the normal force exerted by the surface we stand on, which prevents us from being pulled to the center of the Earth, and not the weight itself.
	en.wikipedia.org /wiki/Weight (765 words)

	Glossary [A-Bomb to AWACS] \| atomicarchive.com
		The atomic bomb is an explosive device that depends upon the release of energy in a nuclear reaction known as fission, which is the splitting of atomic nuclei.
		Atomic number is often symbolized with the letter Z and is shown as a numerical subscript to the left of its chemical symbol.
		As a basis of reference, the atomic weight of the common isotope of carbon (carbon-12) is taken to be exactly 12; the atomic weight of hydrogen (the lightest element) is then 1.008.
	www.atomicarchive.com /Glossary/Glossary1.shtml (1027 words)

	Avogadro's number atomic and molecular weight
		The molecular weight of a molecule is equal to the sum of the atomic weights of its constituting atoms.
		Therefore, the atomic weight is the weight of one mole of atoms, and the molecular weight is the weight of one mole of molecules.
		The atomic weight of Hydrogen, given in the periodic table of the elements, is 1.00794 gram, and the atomic weight of Oxygen is 15.9994 gram.
	urila.tripod.com /mole.htm (813 words)

	Atomic weight (Site not responding. Last check: )
		Atomic weight is the average mass of atoms of an element relative to some standard; the present standard is the carbon- 12 isotope, which is assigned an atomic weight of exactly 12 atomic mass units (amu).
		Mass numbers (the sum of an atom's protons and neutrons) are always whole numbers, but the atomic weight of an element is the average of the weights of its isotopes, taking the frequency of their natural occurrence into account, and is not usually a whole number.
		A gram atomic weight is a quantity of an element in grams that has the same numerical value as the element's atomic weight; the gram atomic weight of carbon is 12 grams.
	chemistry.mtu.edu /~pcharles/SCIHISTORY/Atomic_weight_.html (133 words)

	Atomic Theory (Site not responding. Last check: )
		The observed atomic weight of chlorine is 35.46.
		The atomic volume of an element is the relative atomic mass of the element divided by is density.
		The atomic weight of an element is its relative atomic mass, which is the ratio of the average mass per atom of the naturally occurring form of an element to one twelfth (i.e.
	www.ucc.ie /ucc/depts/chem/dolchem/html/dict/atom.html (1217 words)

	Atomic weight
		In reference to a certain isotope of a chemical element, atomic weight (also called atomic mass) is the mass of one atom of the isotope expressed in units (atomic mass unit, amu) such that the Carbon-12 isotope receives atomic weight 12.
		The atomic weight is the sum of neutrons and protons in the nucleus of the atom.
		In reference to a certain chemical element, atomic weight (also called average atomic weight, atomic mass, or average atomic mass) is the average atomic weight of the chemical element's isotopes.
	www.sciencedaily.com /encyclopedia/atomic_weight (390 words)

	List of Elements of the Periodic Table - Sorted by Atomic Weight
		Atomic mass: The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus.
		C, that is taken as a standard element with an atomic mass of 12.
		Atomic weight: Atomic weight values represent weighted average of the masses of all naturally occurring isotopes of an element.
	www.science.co.il /PTelements.asp?s=Weight (507 words)

	Atomic Weight
		John Dalton had discovered that the weights of elements involved in chemical reactions always have to be in certain proportions.
		If you don't want any leftover hydrogen or oxygen, then the weight of oxygen you start with has to be eight times the weight of the hydrogen.
		Think about what's going on in the reaction: two hydrogen atoms and one oxygen atom join together to make one water molecule.
	www.colorado.edu /physics/2000/periodic_table/atomic_weight.html (245 words)

	Definition of atomic weight - Merriam-Webster Online Dictionary
		: the mass of one atom of an element; specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units — see element table
		Find more about "atomic weight" instantly with Live Search
		See a map of "atomic weight" in the Visual Thesaurus
	www.m-w.com /dictionary/atomic+weight (71 words)

	gram-atomic weight - OneLook Dictionary Search
		We found 9 dictionaries with English definitions that include the word gram-atomic weight:
		Tip: Click on the first link on a line below to go directly to a page where "gram-atomic weight" is defined.
		noun: the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element
	www.onelook.com /?loc=rescb&w=gram-atomic+weight (147 words)

	Chemicals for Chemistry Sets
		_____ Calcium, chunks, 0.1 gram atomic weight, 4.008 g
		_____ Chromium, granular, 0.1 gram atomic weight, 5.200 g
		_____ Chromium, granular, 1 gram atomic weight, 51.996 g
	www.hms-beagle.com /CChemicals.html (395 words)

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