11 Na 钠 Sodium12 Mg 镁 Magnesium13 Al 铝 Aluminium14 Si 硅 Silicon15 P 磷 Phosphorus16 S 硫 Sulfur17 Cl 氯 Chlorine18 Ar 氩 Argon19 K 钾 Potassium20 Ca 钙 Calcium
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