Scientists create artificial radioisotopes by bombarding stable atoms of an element with subatomic particles in a nuclear reactor or in an atom smasher, or cyclotron.This is the only naturally-occuring isotope of francium.Properties: The melting point of francium is 27 °C, boiling point is 677 °C, and its valence is 1.It can be produced by artificially bombarding thorium with protons.It occurs naturally in uranium minerals, but there is probably less than an ounce of francium at any time in the total crust of the earth.
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Francium is the heaviest known member of the alkali metals series.It has the highest equivalent weight of any element and is the most unstable of the first 101 elements of the periodic system.
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