Today is the 167th anniversary of the birth of William Ramsay, the scientist who is credited with discovering the noble gases. Google recognized the event with a doodle on 10/2/2019
When the noble gases were being discovered (Argon was the first in 1894, helium closely thereafter in 1895), Mendeleev was very doubtful they were elements. These new species did not fit within his periodic table. Additionally, they didn’t do anything like other elements (make oxides and hydrides, for example). It wasn’t until 1898, when neon, xenon and krypton were also discovered that it occurred to scientists that a new row of the periodic table had been discovered.
In 1900, the radioactive radon was discovered (although the ideas of radioactivity were still being fleshed out at that time by Marie Curie). The last noble gas to be discovered was oganesson, which happened in 2006.
Tomorrow starts the new semester for me, and I finished my course prep (well, tomorrow’s activities anyway) so I figured I would celebrate with a little creativity. Not too long ago, I came across the activity where you can make a t-shirt iron on by drawing on sandpaper. I have sandpaper, some old t-shirts and I splurged on an 8-pack of crayons ($0.67 at Walmart) so I figured I would give it a go.
This year is all about the periodic table, so I wanted a periodic table design. One trend that I particularly like is the number of stable isotopes, which very clearly shows off my favorite element – technetium – because it is the lightest element without any stable isotopes. Technetium’s claim to fame is that it’s the first element to have been synthesized (in 1937) and therefore it is, in my opinion, the element of makers.
Certainly, I am not the only person who makes resolutions in the new year, only to break them in the bleak cold winter and have them pop up periodically throughout throughout spring, possibly summer, only to be completely forgotten in the fall. It is a trend that I have repeated for many years. This year will be no different, and yet it will be quite different. There will be trends, and periodicity in this year’s resolutions, but all of them will be intentional. (Ok, have I drained this ridiculous chemistry pun of what little humor it once had?)
This year, I’m making New Year’s resolutions in honor of 2019 being the International Year of the Periodic Table. I’ve been thinking about this event since it was announced early last year and have come up with a number of projects and activities that I’d like to complete. Usually, I keep my resolutions private, so that if (uhhh when) I break them, I can pretend they never existed. (If a resolution falls in the woods, and there’s no one there to hear my thoughts….) However, this year’s resolutions are more important than my fruitless desires to lose weight or kill off bad habits. I plan to better myself through chemistry (periodically). Ok, I’m done with that. Here’s my list of resolutions for 2019:
I came across this video on the interweb; it’s an interesting overview of paper-restoration process applied to an historical periodic table from Germany. There is at least one error in the dialog; perhaps you can spot it?
There are some neat lesson-plan hooks in this video, if that’s your thing. What chemical property is the conservationist trying to adjust? What chemical(s) are used to do this? What two elements play an important role in paper restoration? Additionally, where do these elements appear on the (current) periodic table? Does that surprise you? Can you propose a chemical reaction that is happening during the restoration process?
The New Year is upon us, and it’s a year that I’ve been waiting for, since it is the 150th anniversary of Mendeleev’s discovery of the periodic properties of the elements. Discovery is probably not the right word here, since other scientists had not only organized the elements in tables but also recognized their periodic properties. That said, Mendeleev is typically credited with the discovery because of what he did with the table of elements: he predicted the properties of undiscovered elements.