Technetium - Periodic Table of Videos
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Uploaded by periodicvideos on Jul 17, 2008
Technetium is element number 43. Videos about all the elements at http://www.periodicvideos.com/
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@LemonWoW131 oxygen, nitrogen, boron, carbon, iron, tin, lead, hydrogen, gold, silver, copper, zinc, phosphorous, sulphur, mercury and many others dont, so i wouldnt say most, but a great deal of them do.
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@LemonWoW131 Yea well helium is the te only noble gas with that ending and none of the halogens end with um.
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Did you realise that most or all of the chemicals on the periodic table of elements ends with an 'um' !!
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I'm dual screening right now haha
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That is my kind of element!
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All elements have unstable radioisotopes, naturally or synthetically. Some elements, like Technetium (Tc) have no stable isotopes. Tc-99 = T½ of 211,100 years. It occurs naturally. Promethium (Pm) is the 2nd unstable element. Pm-147 = T½ of 2.6234 years. It occurs naturally. Tc is a transition metal, and Pm is a lanthanide. The only elements with more naturally occurring radioisotopes are Indium (In) and Rhenium (Re). In-115: (95.7%) T½ = 4.41×10^14 years. Re-187: (62.6%) T½ = 4.12×10^10 years.
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@jasonguyperson Little to nothing is known about elements 113 (ununtrium) and higher. It still seems unlikely. Lead (82) is the last stable element. Next is bismuth (83) with a half-life of about a billion times the age of the universe. This means that elements higher than lead are radioactive (with the exception of bismuth, thorium and uranium, which could be considered stable because they have extremely long half-lives).
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@jasonguyperson CORRECTION - 115, element 115
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can ununpentium (element 117) theoretically exist as a stable isotope??
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@gaswerti Same number of electrons and protons shared by all isotopes of a substance, different number of neutrons: 39, 40 or 41 in our case.
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wrong, you can set it up so that your computer has two monitors (or more) and when you scroll off of one, it will appear on the other
weebleFTW 3 years ago 45
Its called DUAL SCREEN.
NAMLegolas 3 years ago 31