Top 10 chemical elements factsChemical elements quiz
Which chemical element forms compounds which are typically intensely colored?
Chromium. The name of chromium means colour in Greek. Its compounds are used as pigments, including chrome yellow which had been used to paint school buses and chromium oxides used as a green color in glassmaking. Natural rubies are colored red due to chromium ions.
What gave the name to the indium chemical element?
Indigo dye. In 1863, the German chemists Ferdinand Reich and Hieronymous Theodor Richter found a blue line in the spectrum of tested minerals. As no element was known with a bright blue emission, they concluded a new element was present, and they named it from the indigo color in its spectrum.
Which naturally occurring chemical element is the densest?
Osmium. The density of osmium is 22,570 kg/m3, slightly more than Iridium (22,420) and platinum (21,450). Commonly used metals are considerably less dense - the density of iron is 7,870, lead 11,340 and mercury 13,456.
What is the half-time of radiocarbon? (carbon-14)
5730 years. Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Carbon-12 and carbon-13 are both stable, while the half-life of carbon-14 is 5,730 ±40 years.
Which of the following is not a chemical element?
Brass. Copper, iron and chromium are chemical elements. Brass is a metal alloy made of copper and zinc.
What is the name of the most radioactive isotope on the planet?
Polonium 210. 210Po is extremely toxic, with one microgram being enough to kill the average adult (250,000 times more toxic than hydrogen cyanide by weight). 210Po was used to kill Russian dissident and ex-FSB officer Alexander V. Litvinenko in 2006.
Which chemical element has the symbol Ta?
Tantalum was named by its discoverer, Swedish chemist Anders Ekberg for Tantalus, a Greek mythological figure, most famous for his eternal punishment in Tartarus. Tantalus was made to stand in a pool of water beneath a fruit tree with low branches, with the fruit ever eluding his grasp, and the water always receding before he could take a drink. Ekberg selected the name because the element's inability to absorb acid recalled Tantalus' punishment to him.