Element 111 ·transition metal
Roentgenium
Written 𬬭 — a character coined for this element that most fonts cannot display, so it may show as an empty box above.
Traditional: 錀
How the character is built
The 钅 radical marks this as a metal, and that is not a coincidence of this one character — it holds right across the table. Read the radical first and the element's state at room temperature is already settled. It is 金 (jīn) squeezed into the space beside another component — radicals change shape by position, which is why 金 is hard to spot until you know to look for 钅.
From 伦琴, the Chinese name for Röntgen; the traditional form 錀 was already an old character for a kind of metal.
This character is used for the element and little else — you are unlikely to meet it outside a chemistry classroom.
Where it sits among the 118
Nothing here has ever existed in bulk, so Roentgenium has no measured melting point, density or natural abundance — the figures published for it are predictions, and they disagree with each other.
First isolated in 1994.
Others built the same way
Every one of these carries 钅, and every one is a metal.