| direct-children | documentation | graph |
PureSubstance | 304 | The Class of Substances with constant composition. A PureSubstance can be either an element (... | ^ |
ElementalSubstance | 119 | The Class of PureSubstances that cannot be separated into two or more Substances by ordinary ... | ^ |
Hydrogen | . | Colourless, odourless gaseous chemical element. Lightest and most abundant element in the universe.... | ^ |
Helium | . | Colourless, odourless gaseous nonmetallic element. Belongs to group 18 of the periodic table. Lowes... | ^ |
Lithium | . | Socket silvery metal. First member of group 1 of the periodic table. Lithium salts are used in psyc... | ^ |
Beryllium | . | Grey metallic element of group 2 of the periodic table. Is toxic and can cause severe lung diseases... | ^ |
Boron | . | An element of group 13 of the periodic table. There are two allotropes, amorphous boron is a brown ... | ^ |
Carbon | 1 | Carbon is a member of group 14 of the periodic table. It has three allotropic forms of it, diamonds... | ^ |
Nitrogen | . | Colourless, gaseous element which belongs to group 15 of the periodic table. Constitutes ~78 percen... | ^ |
Oxygen | . | A colourless, odourless gaseous element belonging to group 16 of the periodic table. It is the most... | ^ |
Fluorine | . | A poisonous pale yellow gaseous element belonging to group 17 of the periodic table (The halogens).... | ^ |
Neon | . | Colourless gaseous element of group 18 on the periodic table (noble gases). Neon occurs in the atmo... | ^ |
Sodium | . | Soft silvery reactive element belonging to group 1 of the periodic table (alkali metals). It is hig... | ^ |
Magnesium | . | Silvery metallic element belonging to group 2 of the periodic table (alkaline-earth metals). It is ... | ^ |
Aluminum | . | Silvery-white lustrous metallic element of group 3 of the periodic table. Highly reactive but prote... | ^ |
Silicon | . | Metalloid element belonging to group 14 of the periodic table. It is the second most abundant eleme... | ^ |
Phosphorus | . | Non-metallic element belonging to group 15 of the periodic table. Has a multiple allotropic forms. ... | ^ |
Sulphur | . | Yellow, nonmetallic element belonging to group 16 of the periodic table. It is an essential element... | ^ |
Chlorine | . | Halogen element. Poisonous greenish-yellow gas. Occurs widely in nature as sodium chloride in seawa... | ^ |
Argon | . | Monatomic noble gas. Makes up 0.93 percent of the air. Colourless, odorless. Is inert and has no tr... | ^ |
Potassium | . | Soft silvery metallic element belonging to group 1 of the periodic table (alkali metals). Occurs na... | ^ |
Calcium | . | Soft grey metallic element belonging to group 2 of the periodic table. Used a reducing agent in the... | ^ |
Scandium | . | Rare soft silvery metallic element belonging to group 3 of the periodic table. There are ten isotop... | ^ |
Titanium | . | White metallic transition element. Occurs in numerous minerals. Used in strong, light corrosion-res... | ^ |
Vanadium | . | Soft and ductile, bright white metal. Good resistance to corrosion by alkalis, sulphuric and hydroc... | ^ |
Chromium | . | Hard silvery transition element. Used in decorative electroplating. Discovered in 1797 by Vauquelin... | ^ |
Manganese | . | Grey brittle metallic transition element. Rather electropositive, combines with some non-metals whe... | ^ |
Iron | . | Silvery malleable and ductile metallic transition element. Has nine isotopes and is the fourth most... | ^ |
Cobalt | . | Light grey transition element. Some meteorites contain small amounts of metallic cobalt. Generally ... | ^ |
Nickel | . | Malleable ductile silvery metallic transition element. Discovered by A.F. Cronstedt in 1751. | ^ |
Copper | . | Red-brown transition element. Known by the Romans as 'cuprum.' Extracted and used for thousands of ... | ^ |
Zinc | . | Blue-white metallic element. Occurs in multiple compounds naturally. Five stable isotopes are six r... | ^ |
Gallium | . | Soft silvery metallic element, belongs to group 13 of the periodic table. The two stable isotopes a... | ^ |
Germanium | . | Lustrous hard metalloid element, belongs to group 14 of the periodic table. Forms a large number of... | ^ |
Arsenic | . | Metalloid element of group 15. There are three allotropes, yellow, black, and grey. Reacts with hal... | ^ |
Selenium | . | Metalloid element, belongs to group 16 of the periodic table. Multiple allotropic forms exist. Chem... | ^ |
Bromine | . | Halogen element. Red volatile liquid at room temperature. Its reactivity is somewhere between chlor... | ^ |
Krypton | . | Colorless gaseous element, belongs to the noble gases. Occurs in the air, 0.0001 percent by volume.... | ^ |
Rubidium | . | Soft silvery metallic element, belongs to group 1 of the periodic table. Rb-97, the naturally occur... | ^ |
Strontium | . | Soft yellowish metallic element, belongs to group 2 of the periodic table. Highly reactive chemical... | ^ |
Yttrium | . | Silvery-grey metallic element of group 3 on the periodic table. Found in uranium ores. The only nat... | ^ |
Zirconium | . | Grey-white metallic transition element. Five natural isotopes and six radioactive isotopes are know... | ^ |
Niobium | . | Soft, ductile grey-blue metallic transition element. Used in special steels and in welded joints to... | ^ |
Molybdenum | . | Silvery-white, hard metallic transition element. It is chemically unreactive and is not affected by... | ^ |
Technetium | . | Radioactive metallic transition element. Can be detected in some stars and the fission products of ... | ^ |
Ruthenium | . | Hard white metallic transition element. Found with platinum, used as a catalyst in some platinum al... | ^ |
Rhodium | . | Silvery white metallic transition element. Found with platinum and used in some platinum alloys. No... | ^ |
Palladium | . | Soft white ductile transition element. Found with some copper and nickel ores. Does not react with ... | ^ |
Silver | . | White lustrous soft metallic transition element. Found in both its elemental form and in minerals. ... | ^ |
Cadmium | . | Soft bluish metal belonging to group 12 of the periodic table. Extremely toxic even in low concentr... | ^ |
Indium | . | Soft silvery element belonging to group 13 of the periodic table. The most common natural isotope i... | ^ |
Tin | . | Silvery malleable metallic element belonging to group 14 of the periodic table. Twenty-six isotopes... | ^ |
Antimony | . | Element of group 15. Multiple allotropic forms. The stable form of antimony is a blue-white metal. ... | ^ |
Tellurium | . | Silvery metalloid element of group 16. Eight natural isotopes, nine radioactive isotopes. Used in s... | ^ |
Iodine | . | Dark violet nonmetallic element, belongs to group 17 of the periodic table. Insoluble in water. Req... | ^ |
Xenon | . | Colourless, odourless gas belonging to group 18 on the periodic table (the noble gases.) Nine natur... | ^ |
Caesium | . | Soft silvery-white metallic element belonging to group 1 of the periodic table. One of the three me... | ^ |
Barium | . | Silvery-white reactive element, belonging to group 2 of the periodic table. Soluble barium compound... | ^ |
Lanthanum | . | (From the Greek word lanthanein, to line hidden) Silvery metallic element belonging to group 3 of t... | ^ |
Cerium | . | Silvery metallic element, belongs to the lanthanoids. Four natural isotopes exist, and fifteen radi... | ^ |
Praseodymium | . | Soft silvery metallic element, belongs to the lanthanoids. Only natural isotope is Pr-141 which is ... | ^ |
Neodymium | . | Soft bright silvery metallic element, belongs to the lanthanoids. Seven natural isotopes, Nd-144 be... | ^ |
Promethium | . | Soft silvery metallic element, belongs to the lanthanoids. Pm-147, the only natural isotope, is rad... | ^ |
Samarium | . | Soft silvery metallic element, belongs to the lanthanoids. Seven natural isotopes, Sm-147 is the on... | ^ |
Europium | . | Soft silvery metallic element belonging to the lanthanoids. Eu-151 and Eu-153 are the only two stab... | ^ |
Gadolinium | . | Soft silvery metallic element belonging to the lanthanoids. Seven natural, stable isotopes are know... | ^ |
Terbium | . | Silvery metallic element belonging to the lanthanoids. Tb-159 is the only stable isotope, there are... | ^ |
Dysprosium | . | Metallic with a bright silvery-white lustre. Dysprosium belongs to the lanthanoids. It is relativel... | ^ |
Holmium | . | Relatively soft and malleable silvery-white metallic element, which is stable in dry air at room te... | ^ |
Erbium | . | Soft silvery metallic element which belongs to the lanthanoids. Six natural isotopes that are stabl... | ^ |
Thulium | . | Soft grey metallic element that belongs to the lanthanoids. One natural isotope exists, Tm-169, and... | ^ |
Ytterbium | . | Silvery metallic element of the lanthanoids. Seven natural isotopes and ten artificial isotopes are... | ^ |
Lutetium | . | Silvery-white rare-earth metal which is relatively stable in air. It happens to be the most expensi... | ^ |
Hafnium | . | Silvery lustrous metallic transition element. Used in tungsten alloys in filaments and electrodes, ... | ^ |
Tantalum | . | Heavy blue-grey metallic transition element. Ta-181 is a stable isotope, and Ta-180 is a radioactiv... | ^ |
Tungsten | . | White or grey metallic transition element, formerly called {wolfram}. Forms a protective oxide in a... | ^ |
Rhenium | . | Silvery-white metallic transition element. Obtained as a by-product of molybdenum refinement. Rheni... | ^ |
Osmium | . | Hard blue-white metallic transition element. Found with platinum and used in some alloys with plati... | ^ |
Iridium | . | Very hard and brittle, silvery metallic transition element. It has a yellowish cast to it. Salts of... | ^ |
Platinum | . | Attractive greyish-white metal. When pure, it is malleable and ductile. Does not oxidize in air, in... | ^ |
Gold | . | Gold is gold colored. It is the most malleable and ductile metal known. There is only one stable is... | ^ |
Mercury | . | Heavy silvery liquid metallic element, belongs to the zinc group. Used in thermometers, barometers ... | ^ |
Thallium | . | Pure, unreacted thallium appears silvery-white and exhibits a metallic lustre. Upon reacting with a... | ^ |
Lead | . | Heavy dull grey ductile metallic element, belongs to group 14. Used in building construction, lead-... | ^ |
Bismuth | . | White crystalline metal with a pink tinge, belongs to group 15. Most diamagnetic of all metals and ... | ^ |
Polonium | . | Rare radioactive metallic element, belongs to group 16 of the periodic table. Over 30 known isotope... | ^ |
Astatine | . | Radioactive halogen element. Occurs naturally from uranium and thorium decay. At least 20 known iso... | ^ |
Radon | . | Colorless radioactive gaseous element, belongs to the noble gases. Of the twenty known isotopes, th... | ^ |
Francium | . | Radioactive element, belongs to group 1 of the periodic table. Found in uranium and thorium ores. T... | ^ |
Radium | . | Radioactive metallic transuranic element, belongs to group 2 of the periodic table. Most stable iso... | ^ |
Actinium | . | Silvery radioactive metallic element, belongs to group 3 of the periodic table. The most stable iso... | ^ |
Thorium | . | Grey radioactive metallic element. Belongs to actinoids. Found in monazite sand in Brazil, India an... | ^ |
Protactinium | . | Radioactive metallic element, belongs to the actinoids. The most stable isotope, Pa-231 has a half-... | ^ |
Uranium | . | White radioactive metallic element belonging to the actinoids. Three natural isotopes, U-238, U-235... | ^ |
Neptunium | . | Radioactive metallic transuranic element, belongs to the actinoids. Np-237, the most stable isotope... | ^ |
Plutonium | . | Dense silvery radioactive metallic transuranic element, belongs to the actinoids. Pu-244 is the mos... | ^ |
Americium | . | Radioactive metallic transuranic element, belongs to the actinoids. Ten known isotopes. Am-243 is t... | ^ |
Curium | . | Radioactive metallic transuranic element. Belongs to actinoid series. Nine known isotopes, Cm-247 h... | ^ |
Berkelium | . | Radioactive metallic transuranic element. Belongs to actinoid series. Eight known isotopes, the mos... | ^ |
Truncating graph at 100 terms |