Atomic Mass 139 (+ facts: Sources, Uses, Color and more...) 2022

All atoms have mass (atomic mass). But what is the chemical element that has 138,9055 as atomic mass?

The answer is Lanthanum. There is so much cool stuff about Lanthanum that I would keep reading if I were you.

Alright now to the facts!

Lanthanum Overview

Atomic Mass

138,9055

Learn more about the atomic mass.

Atomic Number

57

Learn more about the atomic number.

Description

Soft, silvery-white, malleable, ductile metal.

Atomic Symbol

La (Lanthanum)

Discovery

Discovered By: Carl Mosander

Year: 1839

Location: Sweden

State at 20 °C

Solid

Sources

Found with rare earths in monazite and bastnasite. Monazite sand typicall contains 25% lanthanum.

Name Origin

Greek: lanthanein (to be hidden).

Uses

It is used in the electodes of high-intensity, carbon-arc lights. Also used in the production of high-grade europium metal. Because it gives glass refractive properties, it is used in expensive camera lenses.

Want to learn more details and data about Lanthanum? Check my Elements Comprehensive List.

Colored Periodic Table

Need an editable periodic table to edit? Maybe add your school logo, work team or anything else to maker your paper look cool?

Along with basic atom / element information (like Lanthanum-138,9055 atomic mass and all the other atomic data), it also comes with color coded info about: State (Gas, Liquid or Solid at room temperature), Groups/series details and much more...

How about an incentive to share this post? (You will help other colleagues find this blog)

Download and enjoy this complete and colored periodic table for you to edit and enjoy. It's in an editable excel format or .ods (open).
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