The symbol and atomic number of the heaviest alkaline earth elements are, respectively

Question

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The heaviest alkaline earth element is radium with a symbol Ra and an atomic number of 88. Francium (Fr) is not an alkaline earth element; it is in Group 1 of the periodic table. While it is the heaviest element in that group, its atomic number is 87, which is not higher than radium's atomic number. Therefore, choices A, B, and D can be eliminated.

The Symbol and Atomic Number of the Heaviest Alkaline Earth