Nihonium (ニホニウム) is a chemical element. It is also named eka-thallium. It has the symbol Nh. It has the atomic number 113. It is a transuranium element. The name "nihonium" comes from the name of Japan in Japanese, 日本 (nihon).
Quick Facts Pronunciation, Mass number ...
Nihonium, 00Nh|
Pronunciation | (nih-HOH-nee-əm) |
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Mass number | [286] |
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Group | group 13 (boron group) |
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Period | period 7 |
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Block | p-block |
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Electron configuration | [Rn] 5f14 6d10 7s2 7p1 (predicted)[1] (predicted) |
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Electrons per shell | 2, 8, 18, 32, 32, 18, 3 (predicted) |
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Phase at STP | solid (predicted)[1][2][3] |
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Melting point | 700 K (430 °C, 810 °F) (predicted)[1] |
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Boiling point | 1430 K (1130 °C, 2070 °F) (predicted)[1][4] |
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Density (near r.t.) | 16 g/cm3 (predicted)[4] |
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Heat of fusion | 7.61 kJ/mol (extrapolated)[3] |
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Heat of vaporization | 130 kJ/mol (predicted)[2][4] |
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Oxidation states | (−1), (+1), (+3), (+5) (predicted)[1][5][6] |
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Ionization energies | - 1st: 704.9 kJ/mol (predicted)[1]
- 2nd: 2240 kJ/mol (predicted)[4]
- 3rd: 3020 kJ/mol (predicted)[4]
- (more)
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Atomic radius | empirical: 170 pm (predicted)[1] |
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Covalent radius | 172–180 pm (extrapolated)[3] |
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Natural occurrence | synthetic |
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Crystal structure | hexagonal close-packed (hcp) (extrapolated)[7] |
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CAS Number | 54084-70-7 |
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Naming | After Japan (Nihon in Japanese) |
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Discovery | Riken (Japan, first undisputed claim 2004) JINR (Russia) and Livermore (US, first announcement 2003) |
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Main isotopes[8] |
Decay |
|
abundance |
half-life (t1/2) |
mode |
product |
278Nh |
synth |
0.002 s |
α |
274Rg |
282Nh |
synth |
0.061 s |
α |
278Rg |
283Nh |
synth |
0.123 s |
α |
279Rg |
284Nh |
synth |
0.90 s |
α |
280Rg |
ε |
284Cn |
285Nh |
synth |
2.1 s |
α |
281Rg |
SF |
– |
286Nh |
synth |
9.5 s |
α |
282Rg |
287Nh |
synth |
5.5 s?[9] |
α |
283Rg |
290Nh |
synth |
2 s?[10] |
α |
286Rg |
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Category: Nihonium | references |
Close
Nihonium does not exist in nature, and can only be made artificially. It is made from the alpha decay of moscovium.
There are no known uses for nihonium. What nihonium looks like is not known because not enough has been made to see it with human eyesight. Based on trends in the Periodic Table it could be soft, silver color, very reactive metal like sodium.