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 element is blue in liquid state?
Oxygen. Liquid oxygen has a pale blue color and is strongly paramagnetic. The first measurable quantity of liquid oxygen was produced by Polish professors Zygmunt Wróblewski and Karol Olszewski (Jagiellonian University in Kraków) on April 5, 1883.
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.
The rarest chemical element naturally ocurring in the Earth's crust is...
Astatine is a radioactive chemical element with symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. The total amount of astatine in the Earth's crust is estimated to be less than one gram at any given time.
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.