First 20 Periodic Elements
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- 1
- Hydrogen (H+)
- 4
- Helium (He)
- 7
- Lithium (Li+)
- 9
- Beryllium (Be++)
- 11
- Boron (B+++)
- 12
- Carbon (C)
- 14
- Nitrogen (N)
- 16
- Oxygen (O--)
- 19
- Fluorine (F-)
- 20
- Neon (Ne)
- 23
- Sodium (Na+)
- 24
- Magnesium (Mg++)
- 27
- Aluminum (Al+++)
- 28
- Silicon (Si++++)
- 31
- Phosphorus (P+++++)
- 32
- Sulfur (S--)
- 35.5
- Chlorine (Cl-)
- 40
- Argon (Ar)
- 39
- Potassium (K+)
- 40*
- Calcium (Ca++)