$Ra$ is placed at the bottom of the alkaline earth metals. Which of the following is true for this element?

  • A
    It will have the largest atomic size.
  • B
    It will have the lowest density.
  • C
    It will have the least ease of ionization.
  • D
    It will be the least electropositive.

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$A$ white solid '$A$' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid '$A$' is

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