Look at any Periodic Table:
Beryllium #4
Magnesium #12
Calcium #20
Strontium #38
Barium #56
Radium #88
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Beryllium.
The alkaline earth metals are the group 2 elements (on the periodic table). Beryllium is the lightest of them.
The most metallic element is Francium, so the least metallic alkaline earth metal would be the one farthest away from Francium on the periodic table: Beryllium, Be.
Be is the least reactive of alkaline earth metals. It is the first metal of the alkaline earth metals.
All alkali (not alkaline-earth) metals are extremely reactive with water, but within the group, lithium is the least reactive.
The periodic table goes from left to right if your looking for re-activity (with the exception of hydrogen). Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium are the most reactive elements. The Noble gases are the least reactive elements which include Argon, Neon, Helium, Krypton, Xenon, Radon, and (arguably) Ununoctium. Hope that helps!
Pollution makes the Earth angry. At least, in a metaphorical sense.
the earth's core
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