Valency Table List (First Thirty Elements )
Electrons which are present in the outermost shell of an atom are known as “valence electrons” and the number of valence electrons is known as the “valency” of an element.
| S.I. No. | Name of element | Valence shell electrons | valency |
| 1 | Hydrogen | -1,+1 | 1 |
| 2 | Helium | 0 | 0 |
| 3 | Lithium | +1 | 1 |
| 4 | Beryllium | +2 | 2 |
| 5 | Boron | -3, +3 | 3 |
| 6 | Carbon | +2 , +4 | 4 |
| 7 | Nitrogen | -3 ,-2, -1,+1,+2,+3,+4,+5 | 3 |
| 8 | Oxygen | -2 | 2 |
| 9 | Fluorine | +1,-1 | 1 |
| 10 | Neon | 0 | 0 |
| 11 | Sodium | +1 | 1 |
| 12 | Magnesium | +2 | 2 |
| 13 | Aluminium | +3 | 3 |
| 14 | Silicon | -4,+2,+4 | 4 |
| 15 | Phosphorus | -3,+1,+3,+5 | 3 |
| 16 | Sulphur | -2,+2,+4,+6 | 2 |
| 17 | Chlorine | -1,+1,+2,+3,+4,+5,+7 | 1 |
| 18 | Argon | 0 | 0 |
| 19 | Potassium | +1 | 1 |
| 20 | Calcium | +2 | 2 |
| 21 | Scandium | +3 | 3 |
| 22 | Titanium | +2,+3,+4 | 4 |
| 23 | Vanadium | +2,+3,+4,+5 | 5,4 |
| 24 | Chromium | +2,+3,+6 | 2 |
| 25 | Manganese | +2,+3,+4,+6,+7 | 7,4,2 |
| 26 | Iron | +2,+3,+4,+6 | 2,3 |
| 27 | Cobalt | +2,+3,+4 | 3,2 |
| 28 | Nickel | +1,+2,+3,+4 | 2 |
| 29 | Copper | +1,+2,+3 | 2,1 |
| 30 | Zinc | +2 | 2 |
Contrast Of Valency or Oxidation State Along A Period
As we move from left to right across a period, the number of valence electrons of the elements increases and ranges between 1 to 8.
Contrast Of Valency or Oxidation State Down A Group
While moving down in a group, the number of valence electrons remains constant. Therefore all the elements in a group have the same valency.
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