Tennessine (Ts)

From Wikipedia, the free encyclopediaTennessine 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.

Tennessine in the periodic table

SymbolTs
Atomic number117
Group17
Period7
Blockp
Element categoryUnknown

Physical properties

Phase at STPSolid
Density7.17 g/cm3
Atomic weight294 u
Melting point723 K
449.85 °C
841.73 °F
Boiling point883 K
609.85 °C
1129.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)
Electron affinity165.9 kJ/mol
Ionization energies
1 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p5
Electrons per shell2, 8, 18, 32, 32, 18, 7

History

Discovered2009
Discovered byJoint Institute for Nuclear Research