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Related Concept Videos

Alkali Metals03:06

Alkali Metals

24.9K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.9K
Hydrogen Bonds00:26

Hydrogen Bonds

134.3K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
134.3K
Hydrogen Bonds01:04

Hydrogen Bonds

15.0K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
15.0K
Bonding in Metals02:32

Bonding in Metals

52.6K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.6K
Metallic Solids02:37

Metallic Solids

20.9K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.9K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.4K

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Metallic hydrogen.

Isaac F Silvera1, Ranga Dias1

  • 1Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 12, 2018
PubMed
Summary
This summary is machine-generated.

Scientists achieved metallic hydrogen (MH) at 4.95 megabars, a state potentially metastable and a room-temperature superconductor. This breakthrough advances understanding of hydrogen

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Area of Science:

  • Condensed matter physics
  • High-pressure physics
  • Planetary science

Background:

  • Hydrogen is the most abundant element.
  • Wigner and Huntington predicted metallic hydrogen (MH) formation at 0 K.
  • Metallic hydrogen may possess unique properties like superconductivity.

Purpose of the Study:

  • To experimentally observe the Wigner-Huntington transition to metallic hydrogen.
  • To investigate the phase diagram of hydrogen under extreme pressure.
  • To explore the potential technological applications of metallic hydrogen.

Main Methods:

  • Utilizing static high-pressure apparatus to compress molecular hydrogen.
  • Achieving pressures of 4.95 megabars to induce the molecular-to-atomic transition.
  • Observing the Wigner-Huntington transition at near-zero Kelvin.

Main Results:

  • Observed the predicted Wigner-Huntington transition to atomic metallic hydrogen at 4.95 megabars.
  • Metallic hydrogen created is likely metastable and may be a room-temperature superconductor.
  • Also observed the liquid-liquid plasma phase transition in hydrogen at 1-2 megabars and 1000-2000 K.

Conclusions:

  • The Wigner-Huntington transition to metallic hydrogen has been experimentally confirmed.
  • The creation of metastable metallic hydrogen opens avenues for technological innovation.
  • This research significantly expands the known phase diagram of hydrogen.