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Manmade elements. These have traditionally been considered to be: Technetium, Promethium, Neptunium, and all elements beyond Neptunium. However trace levels of several of these have since then been detected naturally.
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Hurricane Katrina was in August of 2005. Since it is 2012 now that makes it 7 years.
There are many relatively new elements that have been added to the periodic table over the last few decades, like the element Copernicium, a man made element that was discovered by the Gesellschaft fur Schwerionenforschung (GSI) in 1996. And although there have not been any discoveries in the last 14 years, there are quantum physicists that spend there time looking for the next element.
112 elements have been named and additional 6 elements have been tentatively proposed.
As of January 2014, there have been 12 named elements added to the periodic table since 1960.
The modern periodic table of the elements was published by Dimitri Mendeleev in 1869. Several new elements have been discovered and added to the table since then.
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Added to what?
10 have been added!!!!17 A+
As of 2021, there are approximately 280 million cars in the United States. This number includes both passenger cars and light trucks.
They have been going since 2005.
Since 2005.
since 2005.
17 years old ...
Additional elements have been discovered and added including the synthetic elements. Some of the previously "synthetic" elements have been discovered to be naturally occurring, and have been changed to reflect this. The Atomic Mass calculations have been improved.
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