Timeline for Single letter chemical elements on a 2x2 grid
Current License: CC BY-SA 3.0
2 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 4, 2016 at 19:11 | comment | added | Peter Janssen | Kudos for using Cn. Wasn't named when I first heard about this puzzle. | |
| Aug 4, 2016 at 9:23 | history | answered | peszo | CC BY-SA 3.0 |