Elements questions This is a list of recently added questions about elements. How many hydrogen isotopes occur naturally on the Earth?Three isotopes of hydrogen occur naturally on the Earth: the most frequent protium (1H), deuterium (2H) and tritium (3H). Other isotopes of hydrogen (4H-7H) were created in laboratories and are highly unstable.Created by: Paweł Kołodziejczyknames riddles »hard 58% oneone880twotwo1370threethree3792fourfour440 Which of the following countries doesn't have its "own" element?Italy. Polonium was discovered by Maria Skłodowska-Curie in 1898 and named in honour of Poland. Germanium was named by the German chemist Clemens Winkler. Francium was named by the French chemist and the physicist Marguerite Perey. Created by: Paweł Kołodziejczykchemistry riddles »average 68% PolandPoland344GermanyGermany497ItalyItaly2869FranceFrance478 Which chemical element has been named after the Sun?Helium was first discovered in 1868 as the unexpected line in the spectrum of the chromosphere of the Sun - and so it was named after the Greek word Helios (Sun).Created by: Shankar KumarSun riddles »average 69% GoldGold1040HeliumHelium3348OxygenOxygen81PhosphorusPhosphorus319 What makes depleted uranium a good material for making ammunition?High density. Depleted uranium is 1.67 times as dense as lead, 84% as dense as osmium or iridium, which are the densest known substances under standard (i.e., Earth-surface) pressures. Consequently a depleted uranium projectile of given mass has a smaller diameter than an equivalent lead projectile, with less aerodynamic drag and deeper (armor-piercing) penetration due to a higher pressure at point of impact.Created by: globalquiz.orgfirearms riddles »hard 40% radioactivityradioactivity1060high densityhigh density3958explosivenessexplosiveness2130extreme hardnessextreme hardness2651 This is an iron buoy. Where were its atoms formed?In a high-mass star preceding Sun. Radioactive nickel-56 (which decays to the most common isotope of iron) is the last element to be produced before the collapse of a supernova. That is why the iron was abundantly scattered into space after the supernova explosion.Created by: life-o-holicphysics riddles »very hard 34% in a high-mass star preceding Sunin a high-mass star preceding Sun3284in the Sunin the Sun816in the Earth's corein the Earth's core2852in the Earth's crustin the Earth's crust2583 What is the most common element (by mass) forming the planet Earth?Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.Created by: globalquiz.orgEarth riddles »very hard 31% carboncarbon1674oxygenoxygen1199ironiron1893siliconsilicon1260 What was graphite believed to be a form of?Lead. When large deposit of graphite was found in the 16th century in England, it was thought to be a form of lead. In many languages, the word for pencil literally means lead pen. (German Bleistift, Polish ołówek, Arabic قلم رصاص) Created by: Kasiawriting riddles »average 64% leadlead10809mercurymercury1256ironiron1940chalkchalk2673 Play chemistry quiz and see all the questions.