The heaviest alkaline metal is radium, which is never found in pure form on earth. It is found in small amounts within uranium ores. It has a half life of 1602 years.
Weight is the product of mass x gravitational constant. On earth, the gravitational constant is 32 feet/second or 9.8 meters/second. While Radium has the most mass of the Alkaline metals, It cannot have the most weight since we do not know the gravitational constant of the areas it is naturally located. To give a more concise answer, no element can be said to weigh more than another but an element can have more mass than another.
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