Give the valency and atomic mass of the first 20 elements and other important elements.
S.No. | ELEMENT | Atomic mass | VALENCY |
1 | Hydrogen | 1 | 1 |
2 | Helium | 4 | 0 |
3 | Lithium | 6.94 | 1 |
4 | Beryllium | 9 | 2 |
5 | Boron | 10.81 | 3 |
6 | Carbon | 12 | 2,4 |
7 | Nitrogen | 14 | 3,5 |
8 | Oxygen | 16 | 2 |
9 | Fluorine | 19 | 1 |
10 | Neon | 20 | 0 |
11 | Sodium | 22.99 | 1 |
12 | Magnesium | 24.31 | 2 |
13 | Aluminum | 27 | 3 |
14 | Silicon | 28 | 4 |
15 | Phosphorus | 31 | 3,5 |
16 | Sulfur | 32 | 2,4,6 |
17 | Chlorine | 35.45 | 1,3,5,7 |
18 | Argon | 40 | 0 |
19 | Potassium | 39 | 1 |
20 | Calcium | 40 | 2 |