The element francium (Fr) was the last element of the periodic table discovered in nature. Because of

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The element francium (Fr) was the last element of the periodic table discovered in nature. Because of its high radioactivity, it is estimated that no more than 30g of francium can exist at any given time throughout the Earths crust. Assuming a molar mass of 223 g/mol of francium, what is the approximate number of francium atoms in the Earths crust.