1. H（氢）
2. He（氦）
3. Li（锂）
4. Be（铍）
5. B（硼）
6. C（碳）
carbon dioxide
carbon emissions
7. N（氮）
nitrogen fertilizer
8. O（氧）
an oxygen mask
9. F（氟）
Toothpastes containing fluorine, in the form of sodium fluoride, can help prevent cavities.
Research has shown that small quantities of fluorine can retard the occurrence of cavities in teeth.
10. Ne（氖）
neon lights
11. Na（钠）
Sodium bicarbonate, commonly known as baking soda.
12. Mg（镁）
Excess acids in the stomach can be neutralized by milk of magnesia, a suspension of magnesium hydroxide.
13. Al（铝）
aluminum foil
14. Si（硅）
silicon chips
silicon-based semiconductors
15. P（磷）
16. S（硫）
17. Cl（氟）
18. Ar（氩）
19. K（钾）
20. Ca（钙）
The calcium ion is known as one of the “hardness ions” because its presence products hard water.
Most concretes used today are based on Portland cement. Discovered by an English bricklayer in 1824, Portland found on the Isle of Portland in England. The cement is made from a mixture of limestone, sand, clay, and gypsum. When it is mixed with sand and water, it hardens into the familiar material we see in so many of the structures of our daily life.
21. Sc（钪）
22. Ti（钛）
23. V（钒）
24. Cr（铬）
25. Mn（锰）
26. Fe（铁）
Iron plays a crucial part in the transport of oxygen throughout the body.
27. Co（钴）
28. Ni（镍）
29. Cu（铜）
30. Zn（锌）
31. Ga（镓）
32. Ge（锗）
33. As（砷）
34. Se（硒）
35. Br（溴）
36. Kr（氪）
74. W（钨）
Because tungsten has the highest melting point of any metal, it is used in the filaments of ordinary light bulbs.
- A Guide to the Elements Second Edition, by Albert Stwertka
- Periodic table