Periodic Table and Atom

Atomic Number Symbol Name Atomic Weight (u)
1 H Hydrogen 1.008

2 He Helium 4.0026

3 Li Lithium 6.94

4 Be Beryllium 9.0122

5 B Boron 10.81

6 C Carbon 12.011

7 N Nitrogen 14.007

8 O Oxygen 15.999

9 F Flourine 18.998

10 Ne Neon 20.180

11 Na Sodium 22.990

12 Mg Magnesium 24.305

13 Al Aluminum 26.982

14 Si Silicon 28.085

15 P Phosphorus 30.974

16 S Sulfar 32.06

17 Cl Chlorine 35.45

18 Ar Argon 39.948

19 K Potassium 39.098

20 Ca Calcium 40.078