| 1 | Mongolia has extensive mineral deposits; copper, coal, molybdenum, tin, tungsten and gold account for a large part of industrial production. | |
| 2 | Isotopes of tungsten each have 74 protons in their atoms but different numbers of neutrons - tungsten-182 has 108 neutrons, while tungsten-184 has 110. | |
| 3 | Bamboo became the favorite for several decades, but tungsten supplanted it by 1910. | |
| 4 | It also said that it was working to ensure that minerals used in electronics manufacturing, like tantalum, tungsten and gold, do not come from war-torn regions. | |
| 5 | Willbold and his colleagues concentrated on investigating the ancient Greenland rocks for isotopes of tungsten, a metal that, like gold, has an affinity for bonding with iron. |