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Give Atomic number, Atomic Symbol, Atomic Mass of the First 20 Elements of the Period Table

Last Updated : 29 Feb, 2024
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Here are the atomic number, atomic symbol, and atomic mass of the first 20 elements of the periodic table:

  1. Hydrogen (H)
    • Atomic Number: 1
    • Atomic Symbol: H
    • Atomic Mass: 1.008 atomic mass units (amu)
  2. Helium (He)
    • Atomic Number: 2
    • Atomic Symbol: He
    • Atomic Mass: 4.0026 amu
  3. Lithium (Li)
    • Atomic Number: 3
    • Atomic Symbol: Li
    • Atomic Mass: 6.94 amu
  4. Beryllium (Be)
    • Atomic Number: 4
    • Atomic Symbol: Be
    • Atomic Mass: 9.0122 amu
  5. Boron (B)
    • Atomic Number: 5
    • Atomic Symbol: B
    • Atomic Mass: 10.81 amu
  6. Carbon (C)
    • Atomic Number: 6
    • Atomic Symbol: C
    • Atomic Mass: 12.011 amu
  7. Nitrogen (N)
    • Atomic Number: 7
    • Atomic Symbol: N
    • Atomic Mass: 14.007 amu
  8. Oxygen (O)
    • Atomic Number: 8
    • Atomic Symbol: O
    • Atomic Mass: 15.999 amu
  9. Fluorine (F)
    • Atomic Number: 9
    • Atomic Symbol: F
    • Atomic Mass: 18.998 amu
  10. Neon (Ne)
    • Atomic Number: 10
    • Atomic Symbol: Ne
    • Atomic Mass: 20.180 amu
  11. Sodium (Na)
    • Atomic Number: 11
    • Atomic Symbol: Na
    • Atomic Mass: 22.990 amu
  12. Magnesium (Mg)
    • Atomic Number: 12
    • Atomic Symbol: Mg
    • Atomic Mass: 24.305 amu
  13. Aluminum (Al)
    • Atomic Number: 13
    • Atomic Symbol: Al
    • Atomic Mass: 26.982 amu
  14. Silicon (Si)
    • Atomic Number: 14
    • Atomic Symbol: Si
    • Atomic Mass: 28.085 amu
  15. Phosphorus (P)
    • Atomic Number: 15
    • Atomic Symbol: P
    • Atomic Mass: 30.974 amu
  16. Sulfur (S)
    • Atomic Number: 16
    • Atomic Symbol: S
    • Atomic Mass: 32.06 amu
  17. Chlorine (Cl)
    • Atomic Number: 17
    • Atomic Symbol: Cl
    • Atomic Mass: 35.453 amu
  18. Argon (Ar)
    • Atomic Number: 18
    • Atomic Symbol: Ar
    • Atomic Mass: 39.948 amu
  19. Potassium (K)
    • Atomic Number: 19
    • Atomic Symbol: K
    • Atomic Mass: 39.098 amu
  20. Calcium (Ca)
    • Atomic Number: 20
    • Atomic Symbol: Ca
    • Atomic Mass: 40.078 amu

These are the first 20 elements of the periodic table, each with its unique atomic number, atomic symbol, and atomic mass. These values provide essential information about the identity and properties of each element.


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