元素周期表 Periodic table (2)

11 Na 钠 Sodium
12 Mg 镁 Magnesium
13 Al 铝 Aluminium
14 Si 硅 Silicon
15 P 磷 Phosphorus
16 S 硫 Sulfur
17 Cl 氯 Chlorine
18 Ar 氩 Argon
19 K 钾 Potassium
20 Ca 钙 Calcium