Holmium is a chemical element with the symbol Ho and atomic number 67. It is a rare-earth element and the eleventh member of the lanthanide series. It is a relatively soft, silvery, fairly corrosion-resistant and malleable metal. Like a lot of other lanthanides, holmium is too reactive to be found in native form, as pure holmium slowly forms a yellowish oxide coating when exposed to air. When isolated, holmium is relatively stable in dry air at room temperature. However, it reacts with water and corrodes readily, and also burns in air when heated. In nature, holmium occurs together with the other rare-earth metals (like thulium). It is a relatively rare lanthanide, making up 1.4 parts per million of the Earth's crust, an abundance similar to tungsten. Holmium was discovered through isolation by Swedish chemist Per Theodor Cleve and independently by Jacques-Louis Soret and Marc Delafontaine, who observed it spectroscopically in 1878. Its oxide was first isolated from rare-earth ores by Cleve in 1878. The element's name comes from Holmia, the Latin name for the city of Stockholm. Like many other lanthanides, holmium is found in the minerals monazite and gadolinite and is usually commercially extracted from monazite using ion-exchange techniques. Its compounds in nature and in nearly all of its laboratory chemistry are trivalently oxidized, containing Ho(III) ions. Trivalent holmium ions have fluorescent properties similar to many other rare-earth ions (while yielding their own set of unique emission light lines), and thus are used in the same way as some other rare earths in certain laser and glass-colorant applications. Holmium has the highest magnetic permeability and magnetic saturation of any element and is thus used for the polepieces of the strongest static magnets. Because holmium strongly absorbs neutrons, it is also used as a burnable poison in nuclear reactors. (Wikipedia).
What is the difference between convex and concave
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
What is the difference between convex and concave polygons
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Holmium - Periodic Table of Videos
A new video about the element Holmium, featuring Stephen Liddle and Martyn Poliakoff. Ytterby video: https://youtu.be/HTvhgd84_WQ Objectivity: http://bit.ly/Objectivity More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on
From playlist All Chemical Elements in Order - Periodic Videos
Holmium (version 1) - Periodic Table of Videos
UPDATED HOLMIUM VIDEO: https://www.youtube.com/watch?v=HQahtzCU0BU More links in description below โโโ Holmium, element number 67, is the king of magnetism. Support Periodic Videos on Patreon: https://www.patreon.com/periodicvideos A video on every element: http://bit.ly/118elements M
From playlist With Portuguese subtitles (Portuguรชs) - Periodic Videos
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
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Lunar Warfare - Lasers or Projectiles?
I present some thoughts about the weapons that might be used on the moon. The vacuum and low gravity could make the moon the ultimate military high-ground in a future war. 4:58 - Holmium lasers emit 2.1 micron light, not 2.1 nanometer
From playlist Optics
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
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Incredibly rare and radioactive elements โข
Plutonium, Uranium, Holmium, Neptunium, Curium and many more. We're at the Oak Ridge National Laboratory, in Tennessee. More links and info in full description โโโ ORNL: https://www.ornl.gov Our thanks to Rose Boll and the team. Our videos on all 118 elements: http://bit.ly/118elements
From playlist Trip to Oak Ridge - Periodic Videos
What is the difference between concave and convex polygons
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Disorder in a classical spin liquid: topological spin glass by Arnab Sen
DISCUSSION MEETING NOVEL PHASES OF QUANTUM MATTER ORGANIZERS: Adhip Agarwala, Sumilan Banerjee, Subhro Bhattacharjee, Abhishodh Prakash and Smitha Vishveshwara DATE: 23 December 2019 to 02 January 2020 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Recent theoretical and experimental
From playlist Novel Phases of Quantum Matter 2019
What is the difference between a regular and irregular polygon
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
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Winter Theory School 2022: Steve Hill
Directly observing quantum spin dynamics and relaxation via electron magnetic resonance
From playlist Winter Theory 2022
Understanding disorder-induced phases in dipolar spin ice by Arnab Sen
Program The 2nd Asia Pacific Workshop on Quantum Magnetism ORGANIZERS: Subhro Bhattacharjee, Gang Chen, Zenji Hiroi, Ying-Jer Kao, SungBin Lee, Arnab Sen and Nic Shannon DATE: 29 November 2018 to 07 December 2018 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Frustrated quantum magne
From playlist The 2nd Asia Pacific Workshop on Quantum Magnetism
The Elements Song - Periodic Table of Videos
Our version of the most famous chemistry anthem - The Elements by Tom Lehrer. See videos on all the elements at http://www.periodicvideos.com/ BLOG (includes editing timeline): http://periodicvideos.blogspot.com/2011/03/elements-song-our-version.html With thanks to Dave Cheeseman: http:
From playlist With Portuguese subtitles (Portuguรชs) - Periodic Videos
What are the names of different types of polygons based on the number of sides
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Jaw-dropping Physics Toys/Gadgets 8
Hi Everyone :) Welcome back! I get asked often: "Where did you get all this stuff?" My goal is to share the real magic of science and physics- and to this end I will update here (and in my store) suggestions on where to get some of these toys, kinetic art pieces, and scientific curiositi
From playlist Jaw-dropping Physics Toys/Gadgets
What are four types of polygons
๐ Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Hereโs How We Could Store Data on a Single Atom
Data storage is getting smaller and smaller, but whatโs the limit? We Could Back Up the Entire Internet on a Gram of DNA - https://youtu.be/wjYLKhaeKL0 Read More: Scientists Have Found a New Way of Storing Information in a Single Atom https://www.sciencealert.com/scientists-find-new-
From playlist Elements | Seeker