Notes

Ytterbium …

Ytterbium is a rare-earth metal of the yttrium subgroup, symbol Yb, atomic number 70, atomic weight 173.04; lustrous, malleable, soluble in dilute acids and liquid ammonia, reacts slowly with water; melts at 824°C, boils a 1427°C; used in chemical research, lasers; garnet doping and X-ray tubes.