tag:blogger.com,1999:blog-7685895068017113351.post5216279638719060382..comments2022-07-05T08:25:58.356-07:00Comments on Chemistry Reflux: Periodic Table with {wildly inaccurate} EMPHASISShawnhttp://www.blogger.com/profile/02633935985970527303noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-7685895068017113351.post-71535537701027460362018-09-23T03:34:47.928-07:002018-09-23T03:34:47.928-07:00Thank you for this very helpful blog. I have been ...Thank you for this very helpful blog. I have been involved in developing a new Periodic Table on behalf of he European Chemical Society (EuChemS) for the International Year of the Periodic Table. It concerns availability, vulnerability and use in mobile phones of the elements. <br />I had planned to use Sheehan's original (with the helium moved as in Carrado's paper) and simply colour the areas. Then I came across this blog so I did some checking and indeed the original areas are way off. So, I had the table redrawn and based the areas on the log of atom abundances. For those who are really interested, I divided the amount in mega tonnes (in the earth's crust and atmosphere) by the atomic weight for each element and took the log to the base 10 of that. For some of the least abundant elements (< 1 megatonne atom) the log is negative so the areas for these are exaggerated. All the other ares are approximate (done by eye), but I think they give a better picture of the actual availabilities. <br />In the supporting comments that will soon appear at http://bit.ly/euchems-pt it says: <br />• The areas relate to numbers of atoms of each element on a logarithmic scale.(Data from the CRC Rubber Handbook, as listed in https://en.wikipedia.org/wiki/Abundances_of_the_elements_(data_page). The data for nitrogen are modified to include atmospheric nitrogen)<br />• There are actually 92 elements in the chart. Two of these elements, technetium (Tc) and promethium (Pm), which are coloured white, are not included in the 90. These are radioactive elements that are mostly synthetic, although very small amounts of Tc do occur naturally.<br /> o Technetium (Tc) is very important for imaging soft tissue such as the heart and it is made through radioactive decay of a longer-lived isotope of Molybdenum (Mo). The formed isotope of Tc has a lifetime of 6 h, just long enough to emit the gamma rays that are needed for imaging and detection by a gamma ray camera after which it is harmlessly excreted.<br />• The other synthetic elements from 93 to 118, after uranium (U), which complete the bottom row of the periodic table have been excluded<br />• The areas for all elements are approximate and for the least abundant and synthetic ones, technetium (Tc), promethium (Pr), polonium (Po), astatine (At), radon (Rn), francium (Fr), radium (Ra), actinium (Ac) and protactinium (Pa), the areas are exaggerated otherwise they would be invisible.<br />The new Periodic Table can be downloaded from https://www.euchems.eu/euchems-periodic-table/ and used at will but may not be altered. The copyright belongs to the European Chemical Society (EuChemS) Anonymoushttps://www.blogger.com/profile/02668091557542166524noreply@blogger.comtag:blogger.com,1999:blog-7685895068017113351.post-71908934910158708622018-07-17T22:17:00.749-07:002018-07-17T22:17:00.749-07:00Get chemistry notes from here: Periodic Table | SE...Get chemistry notes from here: <a href="https://merofuture.com/periodic-table-see-class-10-chemistry-notes/" rel="nofollow">Periodic Table | SEE Class 10 | Chemistry Notes</a>Fix PS4 Errorhttps://www.blogger.com/profile/02350859505166810363noreply@blogger.comtag:blogger.com,1999:blog-7685895068017113351.post-17092327265678644552016-12-20T03:55:17.994-08:002016-12-20T03:55:17.994-08:00The rare earths aren't well represented either...The rare earths aren't well represented either. Ce is about as common as Cu but not as well known.<br /><br />Using a log scale would be a great improvement. Oxygen would then be only ~18 times the area of Tc.Anonymoushttps://www.blogger.com/profile/00567419837429860375noreply@blogger.comtag:blogger.com,1999:blog-7685895068017113351.post-87745420218540919382016-01-06T16:37:35.981-08:002016-01-06T16:37:35.981-08:00Nice hounds Shawn.Nice hounds Shawn.Anonymoushttps://www.blogger.com/profile/05808058482831619079noreply@blogger.comtag:blogger.com,1999:blog-7685895068017113351.post-9506496853609982342015-10-11T11:14:15.810-07:002015-10-11T11:14:15.810-07:00Definitely not a log function. This was a freehand...Definitely not a log function. This was a freehand illustration for children to use like a coloring book page. There's no mathematical algorithm applied. It was just meant to be fun. Shawnhttps://www.blogger.com/profile/02633935985970527303noreply@blogger.com