| 1 | A | B | C | D | E | F | G |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2 | Nihonium - Isotopes |  |  |  |  |  |  |
| 3 | Isotope | Half-life | Half-life | Half-life | Decay mode | Discovery year | Discovery reaction |
| 4 | Isotope | Recent publications | Ref | NUBASE 2016 | Decay mode | Discovery year | Discovery reaction |
| 5 | 278Nh | 1.4 ms | - | 2.3 ms | α | 2004 | 209Bi(70Zn,n) |
| 6 | 282Nh | 73 ms | - | 140 ms | α | 2007 | 237Np(48Ca,3n) |
| 7 | 283Nh | 75 ms | - | 160 ms | α | 2004 | 287Mc(—,α) |
| 8 | 284Nh | 0.91 s | - | 0.93 s | α, EC | 2004 | 288Mc(—,α) |
| 9 | 285Nh | 4.2 s | - | 3.3 s | α | 2010 | 289Mc(—,α) |
| 10 | 286Nh | 9.5 s | - | 7 s | α | 2010 | 290Mc(—,α) |
| 11 | 287Nh | 5.5 s | - | — | α | 1999 | 287Fl(e−,νe) |
| 12 | 290Nh | 2 s | - | — | α | 1998 | 290Fl(e−,νe) |

Question: What are the isotopes with half-lives over a second?
Answer: The isotope ²⁸⁵Nh, as well as ²⁸⁷Nh, ²⁸6Nh, and ²⁹⁰Nh, have half-lives of over a second.