Chemical Elements of the Periodic Table Sorted by Atomic Mass

Overview

• Source: Lenntech
• The document lists the 118 chemical elements of the periodic table sorted by atomic mass.
• Each element entry includes:
  • Atomic Mass
  • Name
  • Symbol
  • Atomic Number

Key Features

• Hydrogen is the lightest chemical element with an atomic mass of 1.0079.
• Hassium is the heaviest listed element with an atomic mass of 277.
• The atomic mass is measured in grams per mol.

Organization

• The elements do not show natural relations as in the traditional periodic system.
• Categories include:
  • Metals
  • Semi-conductors
  • Non-metals
  • Inert noble gases
  • Halogens
  • Lanthanoids
  • Actinoids (rare earth elements)
  • Transition metals

Notable Elements

Here are some example entries:

• Hydrogen (H)

  • Atomic Mass: 1.0079
  • Atomic Number: 1

• Oxygen (O)

  • Atomic Mass: 15.9994
  • Atomic Number: 8

• Iron (Fe)

  • Atomic Mass: 55.845
  • Atomic Number: 26

• Gold (Au)

  • Atomic Mass: 196.9665
  • Atomic Number: 79

• Uranium (U)

  • Atomic Mass: 238.0289
  • Atomic Number: 92

• Hassium (Hs)

  • Atomic Mass: 277
  • Atomic Number: 108

Additional Resources

• A schematic overview of the periodic table in chart form is available.
• Lenntech provides a Molecular Weight Calculator for molecule calculations.

Contact Information

• Lenntech European Head Office

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  • Email: [email protected]

• Lenntech USA LLC

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  • Phone: +1 877 453 8095

• Lenntech DMCC (Middle East)

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Note: This information is up to date as of 2025.