1, hydrogen H 1 2, helium He 4
3. lithium Li 7
4. Almost 9 years old
5. boron B 1 1
6. C 12
7. Nitrogen N 14
8. Oxygen O 16
9. F 19
10, neon northeast 20
1 1，Na 23
12, magnesium Mg 24
13，Al 27
14，Si 28
15, phosphorus P 3 1
16, sulfur 32
17, chlorine Cl 35.5
18, argon argon 40
19, potassium 39
2 1, calcium about 40
22. Chromium Cr 52
23, Mn Mn 55
24. Iron Fe 56
25. Nickel Ni 58.69
Copper 26, copper 64
27. Zinc Zn 65
28, gallium Ga 69.723( 1
29, arsenic is 75.
30. Selenium Selenium 79
3 1, bromine bromine 80
32. Silver Ag 108
33, cadmium CD112.4438+01(8
34, indium in 1 14.438+08 (3
35. Serial number 1 18.7438+00 (7
36.Sb 12 1.760( 1
37. Iodine I 127
38. Cesium Cs 133
39. Baba 137.327(7
40, Pt 195.084(9
4 1，Au 196.966 569(4
42, mercury mercury column 200.59(2
43. Radium Re 226