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Bulk properties[ edit ] Thorium is a moderately soft, paramagneticbright silvery radioactive actinide metal. In the periodic tableit lies to the right of actiniumto the left of protactiniumand below cerium.
Pure thorium is very 100 real dating sites and, as normal for metals, can be cold-rolledswagedand drawn. Aluminium 's is At the start of period 7from francium to thorium, the melting points of the elements increase as in other periodsbecause the number of delocalised electrons each atom contributes increases from one in francium to four in thorium, leading to greater attraction between these electrons and the metal ions as their charge increases from one to four.
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After thorium, there is a new downward trend in melting points from thorium to plutonium 100 real dating sites, where the number of f electrons increases from about 0. The major impurity is usually thorium dioxide ThO2 ; even the purest thorium specimens usually contain about a tenth of a percent of the dioxide.
Addition of small proportions of thorium improves the mechanical strength of magnesiumand thorium-aluminum alloys have been considered see more a way to store thorium in proposed future thorium nuclear reactors.
Thorium forms eutectic mixtures with chromium and uranium, and it is completely miscible in both solid and liquid states with its lighter congener cerium.
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All elements from polonium element 84 onward are measurably radioactive. Four-fifths of the thorium present at Earth's formation has survived to the present. It is one of only four radioactive elements along with bismuth, protactinium and uranium that occur in large enough quantities on Earth for a standard atomic weight to be determined. This chain of consecutive alpha and beta decays begins with the decay of Th to Ra and terminates at Pb. All of these isotopes occur in nature as trace radioisotopes due to their presence in the decay chains of Th, U, U, and Np : the last of these is long extinct in nature due to 100 real dating sites short half-life 2.
All of the remaining thorium isotopes have half-lives that are less than thirty days and the majority of these have half-lives that are less than ten minutes. Uranium ores with low thorium concentrations can be purified to produce gram-sized thorium samples of which over a quarter is the Th isotope, since Th is one of the daughters of U.]
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