- On 27th August, 2013, researchers from Lund University in Sweden have confirmed the existence of a new chemical element with atomic number 115.
- The ‘super-heavy’ man-made element has been temporarily named ‘ununpentium’.
- The element will likely get a new name if the discovery is formally approved by experts from the International Union of Pure and Applied Physics and Chemistry (IUPAC).
- It presently has an atomic symbol of Uup and is approximately 289 times heavier than hydrogen, which is the lightest element.
- Though it was first proposed by Russian scientists in 2004, the Swedish scientists created it by firing a beam of calcium, which has 20 protons, into a piece of americium, a radioactive element with 95 protons.
- For an entire second, ununpentium burst into existence, composed of 115 protons.
- The research was conducted at the GSI accelerator facility near Darmstadt, Germany, where scientists are known for having discovered six other elements since the early 1980s.
- If added to the periodic table, element 115 would join it’s recently named neighbors, livermorium and flerovium (elements 114 and 116), which were added to the table in 2011.
Other Important Facts
Name Origin: Un (one) un (one) pent (five)
Atomic Number: 115
Atomic Weight of most stable isotope: 288
Density: 13000 (predicted) kg m-3
Phase at Room Temperature: presumably a solid at 298 K
Element Classification: Metal
Period in periodic table: 7
Group in periodic table: 15
Block in periodic table: p-block
Group Name: Pnictogen
Color: unknown, but probably metallic and silvery white or grey in appearance
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