holmium

However, holmium is ferromagnetic at temperatures below 19 K (−254.2 °C; −425.5 °F).

I'm not sure I could have recalled the existence of the element holmium, I've never heard or read much about it.

Lithotripsy is pretty limited, I think the preference in most cases is to use ureteroscopy (using holmium laser ablation to break up stones)..

> a single atom of the element holmium carefully placed on a surface of magnesium oxide.

I reckon holmium deserved a mention, why is it missing?

YTbErYb, Sc Eu You could *almost* squeeze in a seventh, as Holmium is named after the city of Stockholm; and the city Ytterby is in the greater Stockholm area, in Sweden.

When a person has self-respect and is generally respected in the peer group, these sorts of ridiculous, cruel, ad-holmium type attacks just don't happen, or vanish about as soon as they start.

[0] > Przybylski's observations indicated unusually low amounts of iron and nickel in the star's spectrum, but higher amounts of unusual elements such as strontium, holmium, niobium, scandium, yttrium, caesium, neodymium, praseodymium, thorium, ytterbium, and uranium.

To quote Wiki: "Holmium, like all of the lanthanides, is paramagnetic at standard temperature and pressure.

If I'm not mistaken: "invisible" really means it's a "symmetry-forbidden" interaction to disperse the energy stored as a qubit in the holmium atom into the platinum matrix.

Elsethread, it was mentioned that they used Holmium, which is the most magnetically reactive element.