Physics News

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Henry J
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Re: Physics News

Post by Henry J » Fri Oct 07, 2016 1:37 pm

On looking at what they think period 8 will look like, when they have enough samples from those elements to actually measure their properties, it's not a simple extrapolation from the pattern that the first seven periods have.

https://en.wikipedia.org/wiki/Extended_periodic_table
(See diagram below the introduction and table of contents)

The known periods (after the short 1st one) have two columns on the left, and 6 columns on the right, and after the first 3 periods, a bunch of stuff in between. But in that diagram, the 2 column section for period 9 is expected to get filled before the 6 column section that should be in period 8?

I guess technically that means that the s sub-shell (the one with 2 columns) has lower energy than that p sub-shell (the one with 6 columns)?

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lswot
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Re: Physics News

Post by lswot » Fri Oct 07, 2016 5:15 pm

..:roll:
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Re: Physics News

Post by Henry J » Fri Oct 07, 2016 6:09 pm

What, you don't like physics? At least it isn't temporal mechanics! :smile:

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Re: Physics News

Post by lswot » Sat Oct 08, 2016 9:27 am

Henry J wrote:What, you don't like physics? At least it isn't temporal mechanics! :smile:
Well, there is that......but, still........
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Xjmt
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Re: Physics News

Post by Xjmt » Sun Oct 09, 2016 1:33 pm

I think some folks are still here but don't post very often. :scratchhead:

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lswot
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Re: Physics News

Post by lswot » Sun Oct 09, 2016 5:24 pm

Xjmt wrote:I think some folks are still here but don't post very often. :scratchhead:
I have to agree with you.......I hear an echo....echo....echo :smile:
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Re: Physics News

Post by Xjmt » Mon Oct 10, 2016 12:12 pm

lswot wrote:
Xjmt wrote:I think some folks are still here but don't post very often. :scratchhead:
I have to agree with you.......I hear an echo....echo....echo :smile:
:rotfl:

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Re: Physics News

Post by Henry J » Mon Oct 10, 2016 1:05 pm

Can you repeat that?

:chase:

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Re: Physics News

Post by Xjmt » Tue Oct 11, 2016 7:33 am

:nano:

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Re: Physics News

Post by lswot » Tue Oct 11, 2016 11:09 am

He is such a child.... :wink:
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Re: Physics News

Post by Xjmt » Wed Oct 12, 2016 8:50 am

:lol:

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Re: Physics News

Post by Henry J » Wed Mar 28, 2018 11:28 am

I read that labs in Japan and Russia have recently started attempts to produce atoms of element 119, to be followed by element 120. I suppose they could do it in either order. They're both getting raw materials from ORNL (Oak Ridge National Laboratories), for one of the isotopes they need for this, the one that is itself an artificial element that has to be made in a laboratory. If successful this would start a new row on the table, giving it a total of 8 rows. (In school I was taught that it had just 7 rows.)

The article said that elements passed 120 may be beyond current technology, because their expected half lives are so short, and any atoms they produced would decay before they got in range of the detectors. Of course, all they detect for any of these really heavy elements is the decay products from nuclei that no longer exist when the decay products are detected, but still.

On interesting tidbit here is that for the last dozen or so elements added to the table, they can count the number of atoms that have been detected.

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Re: Physics News

Post by brian » Thu Mar 29, 2018 1:15 pm

:cool:
"The future belongs to those who believe in the beauty of their dreams."-- Eleanor Roosevelt

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Re: Physics News

Post by Xjmt » Thu Apr 26, 2018 2:39 pm


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Re: Physics News

Post by Henry J » Thu Apr 26, 2018 5:38 pm

I thought we already knew that CPR could sometimes work a few minutes after a heart stopped.

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