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Relation: subclass

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PureSubstance223The Class of Substances with constant composition. A PureSubstance can be either an element (...^
    ElementalSubstance119The 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 ...^
        Carbon1Carbon 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...^
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