elements having valency 1 to 20 with symbol and name serially
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ELEMENT SYMBOL ATOMIC NUMBER VALENCY
Hydrogen H 1 1
Helium He 2 0
Lithium Li 3 1
Beryllium Be 4 2
Boron B 5 3
Carbon C 6 4
Nitrogen N 7 3
Oxygen O 8 2
Fluorine F 9 1
Neon Ne 10 0
Sodium Na 11 1
Magnesium Mg 12 2
Alluminium Al 13 3
Silicon Si 14 4
Phosphorus P 15 3,5
Sulphur S 16 2,4,6
Chlorine Cl 17 1
Argon Ar 18 0
Potassium K 19 1
Calcium Ca 20 2
Hydrogen H 1 1
Helium He 2 0
Lithium Li 3 1
Beryllium Be 4 2
Boron B 5 3
Carbon C 6 4
Nitrogen N 7 3
Oxygen O 8 2
Fluorine F 9 1
Neon Ne 10 0
Sodium Na 11 1
Magnesium Mg 12 2
Alluminium Al 13 3
Silicon Si 14 4
Phosphorus P 15 3,5
Sulphur S 16 2,4,6
Chlorine Cl 17 1
Argon Ar 18 0
Potassium K 19 1
Calcium Ca 20 2
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Gd
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