Substance | Relationship Strength | Studies | Trials | Classes | Roles |
hydrogen Hydrogen: The first chemical element in the periodic table with atomic symbol H, and atomic number 1. Protium (atomic weight 1) is by far the most common hydrogen isotope. Hydrogen also exists as the stable isotope DEUTERIUM (atomic weight 2) and the radioactive isotope TRITIUM (atomic weight 3). Hydrogen forms into a diatomic molecule at room temperature and appears as a highly flammable colorless and odorless gas.. dihydrogen : An elemental molecule consisting of two hydrogens joined by a single bond. | 2.02 | 1 | 0 | elemental hydrogen; elemental molecule; gas molecular entity | antioxidant; electron donor; food packaging gas; fuel; human metabolite |
methanol Methanol: A colorless, flammable liquid used in the manufacture of FORMALDEHYDE and ACETIC ACID, in chemical synthesis, antifreeze, and as a solvent. Ingestion of methanol is toxic and may cause blindness.. primary alcohol : A primary alcohol is a compound in which a hydroxy group, -OH, is attached to a saturated carbon atom which has either three hydrogen atoms attached to it or only one other carbon atom and two hydrogen atoms attached to it.. methanol : The primary alcohol that is the simplest aliphatic alcohol, comprising a methyl and an alcohol group. | 2.02 | 1 | 0 | alkyl alcohol; one-carbon compound; primary alcohol; volatile organic compound | amphiprotic solvent; Escherichia coli metabolite; fuel; human metabolite; mouse metabolite; Mycoplasma genitalium metabolite |
nickel Nickel: A trace element with the atomic symbol Ni, atomic number 28, and atomic weight 58.69. It is a cofactor of the enzyme UREASE.. nickel ion : A nickel atom having a net electric charge.. nickel atom : Chemical element (nickel group element atom) with atomic number 28. | 2 | 1 | 0 | metal allergen; nickel group element atom | epitope; micronutrient |
1-propanol 1-Propanol: A colorless liquid made by oxidation of aliphatic hydrocarbons that is used as a solvent and chemical intermediate.. propan-1-ol : The parent member of the class of propan-1-ols that is propane in which a hydrogen of one of the methyl groups is replaced by a hydroxy group. | 2.02 | 1 | 0 | propan-1-ols; short-chain primary fatty alcohol | metabolite; protic solvent |
krypton Krypton: A noble gas that is found in the atmosphere. It has the atomic symbol Kr, atomic number 36, atomic weight 83.80, and has been used in electric bulbs. | 2.01 | 1 | 0 | monoatomic krypton; noble gas atom; p-block element atom | |
uranyl acetate uranyl acetate: used after fixation in uranaffin procedure; RN given refers to parent cpd | 2.21 | 1 | 0 | | |
sodium hydroxide Sodium Hydroxide: A highly caustic substance that is used to neutralize acids and make sodium salts. (From Merck Index, 11th ed) | 2.73 | 3 | 0 | alkali metal hydroxide | |
carbonates Carbonates: Salts or ions of the theoretical carbonic acid, containing the radical CO2(3-). Carbonates are readily decomposed by acids. The carbonates of the alkali metals are water-soluble; all others are insoluble. (From Grant & Hackh's Chemical Dictionary, 5th ed). carbonates : Organooxygen compounds that are salts or esters of carbonic acid, H2CO3. | 2.53 | 2 | 0 | carbon oxoanion | |
neon Neon: A noble gas with the atomic symbol Ne, atomic number 10, and atomic weight 20.18. It is found in the earth's crust and atmosphere as an inert, odorless gas and is used in vacuum tubes and incandescent lamps. | 2.71 | 3 | 0 | monoatomic neon; noble gas atom; p-block element atom | |
palladium Palladium: A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.. palladium : Chemical element (nickel group element atom) with atomic number 46. | 2.05 | 1 | 0 | metal allergen; nickel group element atom; platinum group metal atom | |
plutonium Plutonium: A naturally radioactive element of the actinide metals series. It has the atomic symbol Pu, and atomic number 94. Plutonium is used as a nuclear fuel, to produce radioisotopes for research, in radionuclide batteries for pacemakers, and as the agent of fission in nuclear weapons. | 2.38 | 2 | 0 | actinoid atom; f-block element atom | |
silver Silver: An element with the atomic symbol Ag, atomic number 47, and atomic weight 107.87. It is a soft metal that is used medically in surgical instruments, dental prostheses, and alloys. Long-continued use of silver salts can lead to a form of poisoning known as ARGYRIA. | 2.39 | 2 | 0 | copper group element atom; elemental silver | Escherichia coli metabolite |
thorium Thorium: A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography. | 2.58 | 2 | 0 | actinoid atom; f-block element atom | |
americium Americium: A completely man-made radioactive actinide with atomic symbol Am, and atomic number 95. Its valence can range from +3 to +6. Because of its nonmagnetic ground state, it is an excellent superconductor. It is also used in bone mineral analysis and as a radiation source for radiotherapy. | 2.78 | 3 | 0 | actinoid atom; f-block element atom | |
argon Argon: A noble gas with the atomic symbol Ar, atomic number 18, and atomic weight 39.948. It is used in fluorescent tubes and wherever an inert atmosphere is desired and nitrogen cannot be used. | 3.39 | 7 | 0 | monoatomic argon; noble gas atom; p-block element atom | food packaging gas; neuroprotective agent |
gold Gold: A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts. | 2.43 | 2 | 0 | copper group element atom; elemental gold | |
helium Helium: A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. | 2.01 | 1 | 0 | monoatomic helium; noble gas atom; s-block element atom | food packaging gas |
uranium Uranium: A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear weapons and as fuel in nuclear power reactors. | 3.54 | 8 | 0 | actinoid atom; f-block element atom; monoatomic uranium | |
californium Californium: A man-made radioactive actinide with atomic symbol Cf, atomic number 98, and atomic weight 251. Its valence can be +2 or +3. Californium has medical use as a radiation source for radiotherapy. | 2.43 | 2 | 0 | actinoid atom; f-block element atom | |
deuterium Deuterium: The stable isotope of hydrogen. It has one neutron and one proton in the nucleus. | 2.05 | 1 | 0 | dihydrogen | |
radon Radon: A naturally radioactive element with atomic symbol Rn, and atomic number 86. It is a member of the noble gas family found in soil, and is released during the decay of RADIUM.. radon(0) : A monoatomic radon that has an oxidation state of zero. | 4.68 | 26 | 0 | monoatomic radon; noble gas atom; p-block element atom | |
fluorides [no description available] | 2.41 | 2 | 0 | halide anion; monoatomic fluorine | |
lithium fluoride lithium fluoride: RN given refers to cpd with MF of Li-F; GR200-A is LiF activated by Mg, Cu, and P | 2.41 | 2 | 0 | | |
lithium Lithium: An element in the alkali metals family. It has the atomic symbol Li, atomic number 3, and atomic weight [6.938; 6.997]. Salts of lithium are used in treating BIPOLAR DISORDER. | 2.69 | 3 | 0 | alkali metal atom | |
lead Lead: A soft, grayish metal with poisonous salts; atomic number 82, atomic weight 207.2, symbol Pb. | 2.69 | 3 | 0 | carbon group element atom; elemental lead; metal atom | neurotoxin |
aluminum Aluminum: A metallic element that has the atomic number 13, atomic symbol Al, and atomic weight 26.98. | 2.43 | 2 | 0 | boron group element atom; elemental aluminium; metal atom | |
bismuth Bismuth: A metallic element that has the atomic symbol Bi, and atomic number 83. Its principal isotope is Bismuth 209. | 2.08 | 1 | 0 | metal atom; pnictogen | |
beryllium Beryllium: An element with the atomic symbol Be, atomic number 4, and atomic weight 9.01218. Short exposure to this element can lead to a type of poisoning known as BERYLLIOSIS.. beryllium atom : Alkaline earth metal atom with atomic number 4. | 2.71 | 3 | 0 | alkaline earth metal atom; elemental beryllium; metal allergen | adjuvant; carcinogenic agent; epitope |
astatine Astatine: Astatine. A radioactive halogen with the atomic symbol At, and atomic number 85. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Astatine may be of use in the treatment of hyperthyroidism because it emits ALPHA PARTICLES. | 2.15 | 1 | 0 | elemental astatine | |
silicon Silicon: A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight [28.084; 28.086]. | 2.44 | 2 | 0 | carbon group element atom; metalloid atom; nonmetal atom | |
boron Boron: A trace element with the atomic symbol B, atomic number 5, and atomic weight [10.806; 10.821]. Boron-10, an isotope of boron, is used as a neutron absorber in BORON NEUTRON CAPTURE THERAPY. | 2.42 | 2 | 0 | boron group element atom; metalloid atom; nonmetal atom | micronutrient |
radium Radium: A radioactive element of the alkaline earth series of metals. It has the atomic symbol Ra and atomic number 88. Radium is the product of the disintegration of URANIUM and is present in pitchblende and all ores containing uranium. It is used clinically as a source of beta and gamma-rays in radiotherapy, particularly BRACHYTHERAPY. | 2.08 | 1 | 0 | alkaline earth metal atom | |
granite granite: crystalline rock of quartz, orthoclase, muscovite & biotite | 2.08 | 1 | 0 | triazolopyrimidines | |
lead radioisotopes Lead Radioisotopes: Unstable isotopes of lead that decay or disintegrate emitting radiation. Pb atoms with atomic weights 194-203, 205, and 209-214 are radioactive lead isotopes. | 2.08 | 1 | 0 | | |