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Atomic weights of 10 elements on periodic table about to make an historic change
Eureka Alert ^ | 15 Dec 2010 | Leanne Yohemas

Posted on 12/15/2010 5:23:20 PM PST by smokingfrog

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.

(Excerpt) Read more at eurekalert.org ...


TOPICS: Canada; News/Current Events
KEYWORDS: chemistry; elements; science
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FYI
1 posted on 12/15/2010 5:23:24 PM PST by smokingfrog
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To: smokingfrog

FYI yourself. I’m not taking chemistry over :-)


2 posted on 12/15/2010 5:26:02 PM PST by IrishCatholic (No local Communist or Socialist Party Chapter? Join the Democrats, it's the same thing!)
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To: smokingfrog; Physicist; AFPhys; snarks_when_bored; Wonder Warthog; Robert A. Cook, PE; ...
Like, *PING*, dudes and dude-ettes.

Thanks, smokingfrog.

3 posted on 12/15/2010 5:28:15 PM PST by grey_whiskers (The opinions are solely those of the author and are subject to change without notice.)
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To: smokingfrog
For example, sulfur is commonly known to have a standard atomic weight of 32.065. However, its actual atomic weight can be anywhere between 32.059 and 32.076, depending on where the element is found.

So, what they're saying is, the atomic weight of sulfir will STILL be "commonly known" as being pretty damned close to 32.065.

4 posted on 12/15/2010 5:30:48 PM PST by WayneS (Enlightened statesmen will not always be at the helm. -- James Madison)
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To: smokingfrog
I knew they were going to do this some day...And that's why I dropped out of chemistry.

And astronomy...I knew they were going to give Pluto flak in the years ahead.

And Zero....do we need Zero?? They did without it for long time...

5 posted on 12/15/2010 5:32:47 PM PST by Sacajaweau
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To: smokingfrog

With the price of Au going through the roof, they are going to merge it with Pb and do away with alchemy altogether.


6 posted on 12/15/2010 5:33:26 PM PST by monkeyshine
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To: SunkenCiv

Ping. Didn’t see this on FR before.


7 posted on 12/15/2010 5:33:28 PM PST by allmost
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To: mizuki san

ping


8 posted on 12/15/2010 5:35:29 PM PST by sionnsar (IranAzadi|5yst3m 0wn3d-it's N0t Y0ur5:SONY|Why are TSA exempt from their own searches?)
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To: Sacajaweau
And Zero....do we need Zero?? They did without it for long time...

Do what you want. It means nothing to me.

9 posted on 12/15/2010 5:36:33 PM PST by katana (Actually, there IS something wrong with that)
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To: Sacajaweau
And Zero....do we need Zero?? They did without it for long time...

We could still do without him.

10 posted on 12/15/2010 5:36:47 PM PST by sionnsar (IranAzadi|5yst3m 0wn3d-it's N0t Y0ur5:SONY|Why are TSA exempt from their own searches?)
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To: smokingfrog

This is extremely important because all chemical reactions are mass-mass reactions.

In stoichiometrics mass is everything.


11 posted on 12/15/2010 5:40:54 PM PST by Mikey_1962 (Obama: The Affirmative Action President. He's shovel ready!)
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To: smokingfrog; glock rocks; SouthTexas; B4Ranch
My only experience with chemistry came in the spiffy little kit I got one Christmas many many years ago but this statement jumped out at me... the atomic weight of carbon in natural human testosterone is higher than that in pharmaceutical testosterone.
12 posted on 12/15/2010 5:42:12 PM PST by tubebender (If you can not read, this thread will tell you how to get help)
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To: smokingfrog
Vindicated! The mass of elements on the periodic table are based on a unit defined as:

an atomic mass unit or amu is one twelfth of the mass of an unbound atom of carbon-12

This does not take into account any mass defect inherent in the stability of a nuclei. It also assumes an isotopic mixture which may vary from sample to sample.

Point is, as a physics teacher I've had ongoing battles with Chemistry teachers as to the "proper number of significant digits" to use when computing the molecular weights of elements and compounds. I've opted for which ever one made it an whole number because the five, six or seven digit numbers were not necessarily that accurate.

I win!

Sorry, overly punctilious people annoy me more than progressives (people who think they are always right rarely are).

13 posted on 12/15/2010 5:43:38 PM PST by Aevery_Freeman (Fear God and Government - especially when one tries to become the other!)
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To: Mikey_1962

Thank you!

This is really silly. Yes, some Carbon is Carbon 12, some is Carbon 13, that there exist isotopes doesn’t mean that you can’t calculate the atomic mass of the most common isotope.

Sigh, this is really frustrating.


14 posted on 12/15/2010 5:43:54 PM PST by BenKenobi (Obama's book of the month, Herman Melville's Killin' Whitey)
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To: Sacajaweau
And Zero....do we need Zero?? They did without it for long time...

That's what my ex-wife said about me...especially the zero part.

Zero was invented by the Islamic Arabs btw.

15 posted on 12/15/2010 5:44:46 PM PST by Mikey_1962 (Obama: The Affirmative Action President. He's shovel ready!)
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To: Aevery_Freeman

“isotopic mixture which may vary from sample to sample”

Umm no. The definition of the mass of an unbound atom of CARBON 12, assumes just the opposite. That’s why they specify the isotope. This is so the atomic mass of Carbon 12 will remain precisely 12.000 by definition.


16 posted on 12/15/2010 5:46:54 PM PST by BenKenobi (Obama's book of the month, Herman Melville's Killin' Whitey)
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To: BenKenobi
My point exactly, it is an arbitrary unit.

Please, don't be punctilious.

17 posted on 12/15/2010 5:48:48 PM PST by Aevery_Freeman (Fear God and Government - especially when one tries to become the other!)
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To: smokingfrog

What will this mean to the price of Apple stock?


18 posted on 12/15/2010 5:49:17 PM PST by Leo Farnsworth (I'm not really Leo Farnsworth.)
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To: Mikey_1962

You can say that again...

(and I still won’t know what you’re talking about).


19 posted on 12/15/2010 5:51:20 PM PST by smokingfrog (But what do I know?)
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To: Sacajaweau

Hey, it was either count Eris in or kick Pluto out.


20 posted on 12/15/2010 5:51:27 PM PST by Raymann
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To: grey_whiskers

Thanks. I was weighing some hydrogen the other day and noticed a discrepancy. Thought my scale might be off.


21 posted on 12/15/2010 5:55:29 PM PST by decimon
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To: Leo Farnsworth

The AP store will make money because all chemistry students will have to download a new periodic table of the elements for their iPhones.


22 posted on 12/15/2010 5:56:24 PM PST by smokingfrog (But what do I know?)
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To: BenKenobi
Thank you! This is really silly. Yes, some Carbon is Carbon 12, some is Carbon 13, that there exist isotopes doesn’t mean that you can’t calculate the atomic mass of the most common isotope

I was trying to explain to my nephew what makes an element an element.

I told him that it comes down to this: the proton number is the decider.

That is why H+ could be either a Hydrogen ion or a proton.

It is Hydrogen because it lost its electron and has only one proton, it is a proton because a proton is a proton.

23 posted on 12/15/2010 5:56:57 PM PST by Mikey_1962 (Obama: The Affirmative Action President. He's shovel ready!)
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To: WayneS

For example, sulfur is commonly known to have a standard atomic weight of 32.065. However, its actual atomic weight can be anywhere between 32.059 and 32.076, depending on where the element is found.
So, what they’re saying is, the atomic weight of sulfir will STILL be “commonly known” as being pretty damned close to 32.065.

No, the atomic weight for sulfur still be “commonly known” 32 no one cares past that.


24 posted on 12/15/2010 6:02:30 PM PST by chemengineer42
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To: Raymann

Or change the definition of the word “planet.”


25 posted on 12/15/2010 6:02:46 PM PST by firebrand (May the Oregon Rain Beetle lay eggs in their Christmas tree)
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To: smokingfrog

Presumably the weights will remain the same. The tables can be changed, though.


26 posted on 12/15/2010 6:06:09 PM PST by firebrand (May the coal in their stockings turn out to be strontium 90)
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To: firebrand
They did in '06

A celestial body that is (a) in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.

Pluto fails on the last point because of Charon, Nix, and Hydra.

27 posted on 12/15/2010 6:09:45 PM PST by Raymann
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To: IrishCatholic

I KNEW there was a reason not to pay attention the first time. Now that they’ve changed it, I can learn it fresh—with no preconceived ideas.

There is a method to my madness.


28 posted on 12/15/2010 6:16:08 PM PST by Vermont Lt (Don't taze my junk bro.)
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To: Sacajaweau
And Zero....do we need Zero?? They did without it for long time...

I don't know. Ask him:

Saturday, November 24, 2007

The 0' Factor



OFactor


(C)Copyright 2007, C. Burke. All rights reserved.



29 posted on 12/15/2010 6:16:41 PM PST by Tanniker Smith (I didn't know she was a liberal when I married her.)
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To: Mikey_1962

“Zero was invented by the Islamic Arabs btw.”

The HECK it was. The only thing the Islamic Arabs invented was beheadings

The Zero was invented by South Indians. Aryabhatta, is generally considered the “Father of Place Value” but the Zero was probably in place well before it.

http://en.wikipedia.org/wiki/Place-value


30 posted on 12/15/2010 6:26:01 PM PST by SoftwareEngineer
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To: Sacajaweau

No we don’t need Zero. We should impeach the Zero!


31 posted on 12/15/2010 6:36:23 PM PST by AFreeBird (Do I really need the tag?)
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To: Mikey_1962

Is that why Zero keeps adding zeros to my tax bill?


32 posted on 12/15/2010 6:38:28 PM PST by ALPAPilot
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To: smokingfrog
Atomic weights of 10 elements on periodic table about to make an historic change

Aww geeze.....

.....Is MO on an ATOMIC OBESITY crusade now too?

33 posted on 12/15/2010 6:40:29 PM PST by SteamShovel (UTOPIA...Isn't)
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To: smokingfrog
Atomic weights of 10 elements on periodic table about to make an historic change

Also the value of pi will henceforth be 3.333.

34 posted on 12/15/2010 6:49:29 PM PST by Pilsner
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To: Mikey_1962

Sure! I told that to my “Chem 300” Prof one time when he dinged a solution to a problem on one of his exams.
It was stll -10 when I walk out of his office. :>)


35 posted on 12/15/2010 6:53:34 PM PST by TaMoDee
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To: tubebender

I know just enough about chemistry to be dangerous. Probably moreso to myself than others. :)

It’s like somebody got a new scale for Christmas and is now out to correct the world.


36 posted on 12/15/2010 6:56:28 PM PST by SouthTexas (WE are the Wave)
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To: smokingfrog

A major research institution (MRI) has recently announced the discovery of the heaviest chemical element yet known to science. The new element has been tentatively named Governmentium. Governmentium has 1 neutron, 12 assistant neutrons, 75 deputy neutrons, and 224 assistant deputy neutrons, giving it an atomic mass of 312. These 312 particles are held together by forces called morons, which are surrounded by vast quantities of lepton-like particles called peons. Since governmentium has no electrons, it is inert. However, it can be detected as it impedes every reaction with which it comes into contact. A minute amount of governmentium causes one reaction to take over four days to complete when it would normally take less than a second. Governmentium has a normal half-life of three years; it does not decay, but instead undergoes a reorganization in which a portion of the assistant neutrons and deputy neutrons exchange places. In fact, governmentium's mass will actually increase over time, since each reorganization will cause some morons to become neutrons, forming isodopes.

This characteristic of moron-promotion leads some scientists to speculate that governmentium is formed whenever morons reach a certain quantity in concentration. This hypothetical quantity is referred to as Critical Morass.

37 posted on 12/15/2010 6:57:09 PM PST by C210N (0bama, Making the US safe for Global Marxism)
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To: smokingfrog

I guess we’ll now have a “living” Periodic Table...


38 posted on 12/15/2010 7:07:25 PM PST by mikrofon (Elementary, my dear Watson)
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To: allmost; AdmSmith; bvw; callisto; ckilmer; dandelion; ganeshpuri89; gobucks; KevinDavis; ...
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.
Thanks allmost for the ping! Before clicking in I thought this was going to be related to something else that was recently discovered, but it isn't! Thanks also to smokingfrog for the topic.

· String Theory Ping List ·
Periodic Table of Rejected Elements
· Join · Bookmark · Topics · Google ·
· View or Post in 'blog · post a topic · subscribe ·


39 posted on 12/15/2010 7:10:11 PM PST by SunkenCiv (The 2nd Amendment follows right behind the 1st because some people are hard of hearing.)
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http://www.webelements.com/


40 posted on 12/15/2010 7:10:49 PM PST by SunkenCiv (The 2nd Amendment follows right behind the 1st because some people are hard of hearing.)
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To: smokingfrog

How much is earmarked for this change?


41 posted on 12/15/2010 7:14:02 PM PST by mtg
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To: smokingfrog

I had to take chemistry in college, but, it turned out ok because I could check out all the stuff I needed to make a very high quality still and the nerdy chem lab assistant hadn’t a clue.


42 posted on 12/15/2010 7:20:45 PM PST by crazyhorse691 (Now that the libs are in power dissent is not only unpatriotic, but, it is also racist.)
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To: tubebender

Well, for starters human testosterone has carbon-14 in it, while that made from petroleum has had millions of years during which it has all decayed. (This is how “carbon dating” works.) Furthermore, there is a natural isotopic abundance of C-13, about 1% of naturally-occurring carbon is this. But the ratios aren’t exactly the same everywhere, and it’s entirely possible that C-13 is more abundant in human bodies than it is in oil. It wouldn’t have to be much more to be detectably more.


43 posted on 12/15/2010 7:25:14 PM PST by coloradan (The US has become a banana republic, except without the bananas - or the republic.)
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To: decimon
Ironic-tableau-of-the-Elementals ping.


Frowning takes 68 muscles.
Smiling takes 6.
Pulling this trigger takes 2.
I'm lazy.

44 posted on 12/15/2010 7:30:25 PM PST by The Comedian (Government: Saving people from freedom since time immemorial.)
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To: BenKenobi

But when you weigh out carbon in, say, sodium carbonate, it’s a mixture, and so you should calculate it based on the relative abundance of the two isotopes in your carbonate sample. Except that this ratio varies by source, which is the entire point of the whole exercise. What the exact masses of the pure isotopes is (1) is already known and (2) isn’t what is being changed here.


45 posted on 12/15/2010 7:30:32 PM PST by coloradan (The US has become a banana republic, except without the bananas - or the republic.)
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To: smokingfrog

Guess somebody has found a way to sell a few extra periodical table charts during 2011.


46 posted on 12/15/2010 7:31:49 PM PST by rod1
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To: BenKenobi

“Isotopic MIXTURE” M-I-X-T-U-R-E ... meaning... more than one pure isotope.


47 posted on 12/15/2010 7:33:03 PM PST by coloradan (The US has become a banana republic, except without the bananas - or the republic.)
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To: Aevery_Freeman

It’s a ratio.


48 posted on 12/15/2010 7:33:51 PM PST by BenKenobi (Obama's book of the month, Herman Melville's Killin' Whitey)
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To: coloradan

Actually you should be doing the opposite. The chemical reactions permit you to calculate the relative isotope mixture in the sodium carbonate.


49 posted on 12/15/2010 7:36:14 PM PST by BenKenobi (Obama's book of the month, Herman Melville's Killin' Whitey)
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To: smokingfrog
They keep changing this one, too:


50 posted on 12/15/2010 7:37:18 PM PST by TonyInOhio ( Live free or die: Death is not the worst of evils.)
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