First 20 Elements of the Periodic Table

Aluminum

Symbol: Al Atomic Number: 13 Atomic Mass: 26.982

Argon

Symbol: Ar Atomic Number: 18 Atomic Mass: 39.948

Boron

Symbol: B Atomic Number: 5 Atomic Mass: 10.811

Beryllium

Symbol: Be Atomic Number: 4 Atomic Mass: 9.0122

Carbon

Symbol: C Atomic Number: 6 Atomic Mass: 12.011

Calcium

Symbol: Ca Atomic Number: 20 Atomic Mass: 40.078

Chlorine

Symbol: Cl Atomic Number: 17 Atomic Mass: 35.453

Fluorine

Symbol: F Atomic Number: 9 Atomic Mass: 18.998

Hydrogen

Symbol: H Atomic Number: 1 Atomic Mass: 1.0079

Helium

Symbol: He Atomic Number: 2 Atomic Mass: 4.0026

Potassium

Symbol: K Atomic Number: 19 Atomic Mass: 39.098

Lithium

Symbol: Li Atomic Number: 3 Atomic Mass: 6.9410

Magnesium

Symbol: Mg Atomic Number: 12 Atomic Mass: 24.305

Nitrogen

Symbol: N Atomic Number: 7 Atomic Mass: 14.007

Sodium

Symbol: Na Atomic Number: 11 Atomic Mass: 22.990

Neon

Symbol: Ne Atomic Number: 10 Atomic Mass: 20.180

Oxygen

Symbol: O Atomic Number: 8 Atomic Mass: 15.999

Phosphorus

Symbol: P Atomic Number: 15 Atomic Mass: 30.974

Sulfur

Symbol: S Atomic Number: 16 Atomic Mass: 32.065

Silicon

Symbol: Si Atomic Number: 14 Atomic Mass: 28.086