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Chased on atomic mass, the least massive of the alkaline earth metals is Beryllium.

What are alkaline earth metals?

Alkaline earth metals are the metals found in group 2 of the periodic table of elements.

The alkaline earth metals include:

  • Beryllium
  • Magnesium
  • Calcium

The least massive is the first element in the group.

Therefore, the least massive of the alkaline earth metals is Beryllium.

Learn more about alkaline earth metals at: https://brainly.com/question/1085966