10 most difficult elements riddles A list of elements related questions that are most often answered incorrectly Chemistry quiz 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.very hard 29% carboncarbon28%oxygenoxygen21%ironiron29%siliconsilicon20%Created by: globalquiz.org. Statistics based on 9308 answers in 3 languages »Earth riddles » 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.very hard 34% in a high-mass star preceding Sunin a high-mass star preceding Sun34%in the Sunin the Sun8%in the Earth's corein the Earth's core29%in the Earth's crustin the Earth's crust28%Created by: life-o-holic. Statistics based on 14955 answers in 2 languages »physics riddles » How else are the biophilic elements called?Nutrients. A nutrient is a component in foods that is used by an organism to survive and grow. Macronutrients are broken down and converted into the energy needed by an organism's metabolic system to function. Micronutrients provide the necessary cofactors for metabolism to be carried out; they are also used to build and repair tissues and regulate body processes.very hard 39% NutrientsNutrients39%EndokryptneEndokryptne20%CryptomorphicCryptomorphic23%BasicBasic17%Created by: Tschuka. Statistics based on 1055 answers in 3 languages »biology riddles » What was the first chemical element to be artificially produced?Technetium. Many of technetium's properties were predicted by Dmitri Mendeleev, who left a gap in his periodic table before the element was discovered. It was finally discovered by Emilio Segrè and Carlo Perrier in 1937 and named after the Greek word τεχνητός, meaning "artificial", since it was the first element to be artificially produced.very hard 39% promethiumpromethium15%actiniumactinium21%technetiumtechnetium39%plutoniumplutonium24%Created by: Ninjai. Statistics based on 140 answers in 3 languages »chemistry riddles » 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.hard 44% radioactivityradioactivity9%high densityhigh density44%explosivenessexplosiveness19%extreme hardnessextreme hardness26%Created by: globalquiz.org. Statistics based on 20368 answers in 2 languages »nuclear power riddles » 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.hard 58% oneone13%twotwo21%threethree58%fourfour5%Created by: Paweł Kołodziejczyk. Statistics based on 17474 answers in 5 languages »names riddles » 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) average 64% leadlead64%mercurymercury7%ironiron11%chalkchalk16%Created by: Kasia. Statistics based on 26649 answers in 2 languages »writing riddles » 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. average 69% PolandPoland7%GermanyGermany11%ItalyItaly69%FranceFrance10%Created by: Paweł Kołodziejczyk. Statistics based on 8343 answers in 2 languages »chemistry riddles » 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).easy 70% GoldGold20%HeliumHelium70%OxygenOxygen1%PhosphorusPhosphorus7%Created by: Shankar Kumar. Statistics based on 15967 answers in 4 languages »Sun riddles » Which of these metals is a precious metal?Silver. A precious metal is a rare, naturally occurring metallic chemical element of high economic value.They are usually ductile and have a high lustre. Historically, precious metals were important as currency but are now regarded mainly as investment and industrial commodities. Gold, silver, platinum, and palladium each have an ISO 4217 currency code. easy 76% CalciumCalcium2%IronIron4%SilverSilver76%TantalumTantalum17%Created by: Tschuka. Statistics based on 1275 answers in 3 languages »chemistry riddles » Play chemistry quiz and see all the questions.