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uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium and nobelium.
Properties
The transition elements are all metals and have the following general properties:
 They have one or two electrons in their outer shells.
 They are all hard and strong, with high densities, high melting points and high boiling points.  They form a number of oxidation states (for example, iron(ii) and iron(iii)).
 They tend to form coloured compounds (for example, iron(ii) compounds are often green and iron(iii) compounds are often orange-brown).
 Many are catalysts (for example, vanadium and manganese).
 Many are good conductors of heat and electricity (for example, silver and copper).
 Many can easily be bent (are malleable)–they are easily beaten into sheets or drawn into wires, for example, iron.
 They all form basic oxides (but some can also react with both alkalis and acids – for example, zinc and manganese(vii) oxide).  Most of them quickly develop a protective oxide coating when exposed to air and most are fairly unreactive (for example, gold).
 When they react, they tend
to lose electrons, forming positive ions – cations (for example, Fe2+ and Mn2+).
Transuranium elements
Elements that have atomic numbers greater than 92 on the periodic table, thus they all lie beyond uranium.
Tungsten (W)
Element 74 on the periodic table. A white to greyish metal belonging to the transition metals. Tungsten is also called wolfram.
It is the strongest metal in existence and has the highest melting point. It was discovered in 1783 by the Spanish chemists Juan José and Fausto Elhuyar. It is used as an alloy with steel and in the filaments of bulbs. As tungsten carbide, it is used for drill bits.
U
Ununbium (Uub)
Element 112 on the periodic table. One of the most recently discovered elements, very little is so far known about it. Only a few atoms of it have ever been made. That was done by fusing a zinc atom with
a lead atom using a heavy ion accelerator. Atoms of this element have a lifespan of less than a millisecond.
Element 112 was discovered in 1996 by S. Hofmann, V. Ninov,
F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg and others at Darmstadt, Germany.
Ununhexium (Uuh)
Element 116 on the periodic table. One of the most recently discovered elements, only a few atoms have ever been made. They were as a result of the decay of ununoctium. Ununoctium decays less than a millisecond after its formation to make element 116, which then decays in a similarly short time.
Ununnilium (Uun)
Element 110 on the periodic table. One of the most recently discovered elements, only a few atoms have ever been made. Its properties
are probably similar to those of
platinum, except that ununnilium is unstable and decays in a millisecond.
Many billions of nickel atoms were fired at a lead target in order to produce a single atom of ununnilium.
Ununoctium (Uuo)
Element 118 on the periodic table. One of the most recently discovered elements, only a few atoms have ever been made. The experiment was carried out using calculations by Robert Smolanczuk (Soltan Institute for Nuclear Studies, Poland) on the fusion of atomic nuclei.
The atoms were produced by fusing a krypton-86 ion with lead-208 atom using an accelerator. It took 11 days to produce 3 atoms, which then decomposed in a millisecond to ununhexium.
Ununquadium (Uuq)
Element 114 on the periodic table. One of the most recently discovered elements, only a few atoms have ever been made. These atoms were produced by nuclear fusion of a calcium atom with a plutonium atom.
It was discovered by workers at the Nuclear Institute at Dubna, Russia, in December 1998.
Unununium (Uuu)
Element 111 on the periodic table. One of the most recently discovered elements, only a few atoms have ever been made. That involved the nuclear fusion of
an isotope of bismuth with an isotope of nickel using a heavy ion accelerator.
Unununium was discovered on December 8, 1994, at Darmstadt in Germany by S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg and others.
Unununium (Uuu)
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