我想要化学元素前20号对应的每个英语单词答:1 Hydrogen, 2 Helium, 3 Lithium, 4 Beryllium, 5 Boron, 6 Carbon, 7 Nitrogen, 8 Oxygen, 9 Fluorine, 10 Neon, 11 Sodium, 12 Magnesium, 13 Aluminium, 14 Silicon, 15 Phosphorus, 16 Sulphur, 17 Chlorine, 18 Argon, 19 Potassium, 20 Calcium.