Which of the following statements is true regarding alkaline earth metals?

  • A
    They are diatomic and form $M^{2-}$ type ions.
  • B
    They are highly electronegative elements.
  • C
    They are monoatomic and form $M^+$ type ions.
  • D
    They are monoatomic and form $M^{2+}$ type ions.

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