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Element M can be a choice of 4 elements, Beryllium, Magnesium, Calcium, or Strontium.

The element must have an oxidation of +2, which means group 2 elements.

The atomic radius of a barium atom is 222pm. Radium has a larger atomic radius that Barium, so that is eliminated, and Barium is the same as Barium so that is also eliminated.

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Q: Element M reacts with chlorine to for a compound MCl2 Element M is more reactive than magnesium and has a smaller radius than barium the element is?
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