Ions of Alkaline Earths First Ionization Energy (kJ/mol) Second Ionization Energy (kJ/mol) Standard Reduction Potential (V = J/C) Lithium520.27298-3.040 Beryllium899.41757-1.85 Magnesium737.71451-2.356 Calcium589.71145-2.84 Strontium549.51064-2.89 Barium502.8965-2.92 Cesium375.72234-2.923 3 Only forms +2 cations i) Has two valence electrons: [N.G.] ns 2 ii) Low first and second ionization energies iii) Excellent reducing agents.
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