Navigation Links
Atomic weights of 10 elements on periodic table about to make an historic change
Date:12/15/2010

For the first time in history, a change will be made to the atomic weights of some elements listed on the Periodic table of the chemical elements posted on walls of chemistry classrooms and on the inside covers of chemistry textbooks worldwide.

The new table, outlined in a report released this month, will express atomic weights of 10 elements - hydrogen, lithium, boron, carbon, nitrogen, oxygen, silicon, sulfur, chlorine and thallium - in a new manner that will reflect more accurately how these elements are found in nature.

"For more than a century and a half, many were taught to use standard atomic weights a single value found on the inside cover of chemistry textbooks and on the periodic table of the elements. As technology improved, we have discovered that the numbers on our chart are not as static as we have previously believed," says Dr. Michael Wieser, an associate professor at the University of Calgary, who serves as secretary of the International Union of Pure and Applied Chemistry's (IUPAC) Commission on Isotopic Abundances and Atomic Weights. This organization oversees the evaluation and dissemination of atomic-weight values.

Modern analytical techniques can measure the atomic weight of many elements precisely, and these small variations in an element's atomic weight are important in research and industry. For example, precise measurements of the abundances of isotopes of carbon can be used to determine purity and source of food, such as vanilla and honey. Isotopic measurements of nitrogen, chlorine and other elements are used for tracing pollutants in streams and groundwater. In sports doping investigations, performance-enhancing testosterone can be identified in the human body because the atomic weight of carbon in natural human testosterone is higher than that in pharmaceutical testosterone.

The atomic weights of these 10 elements now will be expressed as intervals, having upper and lower bound
'/>"/>

Contact: Leanne Yohemas
leanne.yohemas@ucalgary.ca
403-540-6552
University of Calgary
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Magnetisms subatomic roots
2. Caltech chemists develop simple technique to visualize atomic-scale structures
3. SAGE to publish the Bulletin of the Atomic Scientists
4. Atomic-level snapshot catches protein motor in action
5. Anatomical Science International joins Springers publishing program
6. Atomic-resolution views suggest function of enzyme that regulates light-detecting signals in eye
7. Tipping elements remain a hot issue
8. Dust deposited in oceans may carry elements toxic to marine algae
9. New research shows how gene function drives natural selection in important class of genetic elements
10. From sheet metal elements to host cells: DFG launches 10 new collaborative research centers
11. Periodic heart rate decelerations in premature infants
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Atomic weights of 10 elements on periodic table about to make an historic change
(Date:4/15/2014)... San Diego have succeeded in visualizing the movement ... growth and resistance to drought. The achievement will ... how the hormone helps plants respond to drought ... increase in the atmosphere,s carbon dioxide, or CO2, ... the April 15 issue of the scientific journal ...
(Date:4/15/2014)... of the loveliest in the world, but they also ... soils have become enriched in cadmium. Grasses take up ... the cattle and sheep that graze them. The problem ... reported worldwide. , The concern is that if cadmium ... products, human health and New Zealand,s agricultural economy could ...
(Date:4/15/2014)... the Congo Basin to increase by 0.7 C. ... gases by half, according to a study by ... Explosive population growth and inefficient agricultural practices are ... Africa. A team of researchers from the University ... longer-term temperatures in the region. Using a sophisticated ...
Breaking Biology News(10 mins):Biologists develop nanosensors to visualize movements and distribution of plant hormone 2Study: Deforestation could intensify climate change in Congo Basin by half 2
... ways in which cooperation is the theme of a paper ... scientists at the Marine Biological Laboratorys (MBL) Josephine Bay Paul ... where the Alliegros thank those who helped them after Hurricane ... in New Orleans and their lives in 2005. ...
... sophisticated unmanned aircraft, research scientists at Scripps Institution ... Southern Californias potential for climate change and better ... by the California Energy Commission, the California AUAV ... aerial vehicles (AUAVs) to gather meteorological data as ...
... a protein in the blood linked to defence ... previously understood in the bodys immune defence system. ... of how the body defends against disease and heals ... protein, Properdin discovered only half a century ago- can ...
Cached Biology News:The cooperative view: New evidence suggests a symbiogenetic origin for the centrosome 2Unmanned aircraft to study Southern California smog and its consequences 2Unmanned aircraft to study Southern California smog and its consequences 3New discovery on role of vital protein that fights meningitis 2
(Date:1/15/2014)... IPSWICH, England , January 15, 2014 ... whether technology developed to win races on the Formula ... obesity.  This unique healthcare collaboration between McLaren Applied Technologies ... academics at University Campus Suffolk is being funded by ... inspired by equipment used to collect data about the ...
(Date:1/15/2014)... Two champions of science, technology, ... sponsorship of an annual competition for middle and ... and access to, innovative STEM study. The competition ... , TEAMS: Tests of Engineering Aptitude, Mathematics, ... the Technology Student Association (TSA). TEAMS provides hands-on ...
(Date:1/15/2014)... DTS Language Services, Inc . is pleased ... for Life Science organizations who need document translations. ... subject matter of their documents in advance with a ... help reduce time-to-delivery of translations, often a critical factor ... of error. , “All translations are inherently time-sensitive by ...
(Date:1/15/2014)... 15, 2014 Freeslate, Inc ... solutions, today announced that Lupin Limited, one of ... of Freeslate’s CM Protégé PharmD System ... Lupin, headquartered in Mumbai, India, is focused on ... branded formulations and Active Pharmaceutical Ingredients (APIs) for ...
Breaking Biology Technology:Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5DTS Improves Efficiency for Life Science Document Translations 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3
... May 21 The American Acne & Rosacea Society ... Month which will occur in June 2009. At the ... Rosso, DO, President, stated that National Acne Awareness Month ... the treatment of acne and to generate awareness for ...
... Inc. ("Sinobiopharma ", or "the Company") (OTC Bulletin ... has applied for two Chinese patents for its ... relaxant. The Company has applied to China,s State ... for Atracurium,s freeze-drying compounds (Application Number 200710127756.2; "Atracurium,s ...
... 20 InspireMD, Ltd. announced today,the completion of ... The trial was designed to confirm the clinical ... Primary PCI in STEMI,patients. , ... single arm, 60 patients,study (Principal investigator: Dr. Dariusz ...
Cached Biology Technology:American Acne & Rosacea Society Announces Acne Awareness Month - June 2009 2Sinobiopharma Applies For Two Chinese Patents For Cisatracurium Besylate 2InspireMD Announce the Completion of Enrollment for the MAGICAL Trial (MGuard(TM) in Acute Myocardial Infarction) at EuroPCR '09. Results Will be Presented May 21st by Dr. Dariusz Dudek at the InspireMD Cocktail Reception Debate Chaired by Prof. Martin Le 2InspireMD Announce the Completion of Enrollment for the MAGICAL Trial (MGuard(TM) in Acute Myocardial Infarction) at EuroPCR '09. Results Will be Presented May 21st by Dr. Dariusz Dudek at the InspireMD Cocktail Reception Debate Chaired by Prof. Martin Le 3