• 6s2

  • 7s2

  • 7s2 7p6

  • 7s2 7p4


Radium is a chemical element with the symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals.The electron configuration (short form) of radium is [Rn]7s2 .

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