Tennessine is a superheavy artificial chemical element with an atomic number of 117 and a symbol of Ts. Also known as eka-astatine or element 117, it is the second-heaviest known element and penultimate element of the 7th period of the periodic table. As of 2016, fifteen tennessine atoms have been observed:six when it was first synthesized in 2010, seven in 2012, and two in 2014.
117
Atomic Number
294
Atomic Mass (u)
7.17
Density (solid: g/cm³, gas: g/liter)
165.9
Electron Affinity
7
Number of Shells
7
Electron Valency
2, 8, 18, 32, 32, 18, 7
Electron Shell Occupations