Periodic Table

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I wish to establish some sort of system not guided by chance but by some sort of definite and exact principle. — Dmitri Mendeleev

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Introduction¹

American Chemical Society (YouTube Channel)
Periodic Table (American Chemical Society)

Dictionary

periodic+table : an arrangement of chemical elements based on the periodic law — Merriam-Webster See also OneLook

Encyclopedia

Periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows periodic trends. Generally, within one row (period) the elements are metals to the left, and non-metals to the right, with the elements having similar chemical behaviours placed in the same column. Table rows are commonly called periods and columns are called groups. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals. — Wikipedia

Periodic Table of Elements (Encyclopædia Britannica)

Periodic Table of Elements (International Union of Pure and Applied Chemistry)
Interactive Periodic Table of Elements (Los Alamos National Laboratory)
Periodic Table (American Chemical Society)
WebElements: The Periodic Table on the WWW

Search

Chemical Elements (Wolfram Alpha)

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Adventures

Explore related posts on Cosma …

Periodic Party - Hey, it is the Periodic Table’s Birthday! Dmitri Mendeleev sketched his first draft of the Periodic Table of Chemical Elements on February 17, 1869. Notice that this year’s a “big one” for the Periodic Table — it’s 150 years old! In fact, it’s such a big deal that the United Nations General Assembly and UNESCO … Continue reading Periodic Party

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Inspiration

Talks about Periodic Table (TED: Ideas Worth Spreading)
Articles about Periodic Table (Big Think)

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Innovation

Science

The Quest for Superheavy Elements and the Island of Stability (Christoph E. Düllmann and Michael Block, Scientific American)

Commerce

Entrepreneurship

Periodic Table of Elements Campaigns (Kickstarter)

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Preservation

History

Niels Bohr Archive (University of Copenhagen)
Niels Bohr Institute (University of Copenhagen)
Niels Bohr (Encyclopædia Britannica)
Neils Bohr (Wikipedia)

Brief History of the Development of the Periodic Table (Western Oregon University)

The Periodic Tables We Almost Had (Mark Lorch, Quartz)
Alternate Periodic Table Designs (Western Oregon University)
The Internet Database of Periodic Tables

Library

DDC: 546.8 Periodic Table (Library Thing)
Subject: Periodic Table (Library Thing)

Subject: Periodic Table (Open Library)

LCC: QD 467 Periodic Table (UPenn Online Books)

LCC: QD 467 Periodic Table (Library of Congress)
Subject: Periodic Table (Library of Congress)

Subject: Periodic Table (WorldCat)

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Participation

Education

Chemistry (Free Animated Education, YouTube Playlist)
Free Animated Education (Facebook)

Periodic Table and the Elements (Chem4Kids)

Chemistry Education Resources on the Periodic Table (American Chemical Society)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

Course

The Periodic Table (Crash Course Chemistry)

General Chemistry I: Atoms, Molecules, and Bonding (MITx)

Chemistry Department Courses (MIT OpenCourseWare)
Chemistry Courses (edX)

MicroBachelors Program in University Chemistry (HarvardX)

Community

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Expression

Here Come Science (They Might be Giants, YouTube Playlist)
They Might Be Giants (Official Site)
They Might Be Giants (Wikipedia)

Fun

The Comic Book Periodic Table of the Elements (John P. Selegue & F. James Holler, Department of Chemistry, University of Kentucky)

Recent News from Phys.org …

Uranium forms rare triple bond with carbon in...
on October 2, 2026 at 2:40 pm
In a study published in Nature Chemistry, an international team of researchers from Germany and the U.K., including chemists from The University of Manchester, has synthesized and characterized what they describe as the first isolable uranium Fischer-type carbyne, a compound in which carbon forms an unusual triple-bond interaction with uranium.
New form of flexible boron is 10 million times...
on September 25, 2026 at 1:20 pm
The atoms of the 5th element of the periodic table often find themselves in the company of each other, forming allotropes with a rich variety of structural motifs, each carrying a unique set of chemical and physical properties. Despite the long catalog, most boron allotropes do not simultaneously possess high electrical conductivity and plasticity, but a recent study has expanded the portfolio.
JWST finds early galaxies were already seeding...
on September 24, 2026 at 9:00 am
When the universe was still in its infancy—only 500 million years after the Big Bang, or about 3% of its current age—some of the universe's earliest stars and galaxies had already formed. Astronomers have long predicted that much of the gas surrounding these young galaxies must have remained relatively pristine, composed mostly of hydrogen and helium, the primordial ingredients available in the newborn cosmos.
Aiming at number 9: CASPAR targets fluorine in...
on September 23, 2026 at 9:40 pm
The Compact Accelerator System for Performing Astrophysical Research (CASPAR) recreates conditions inside stars to study how elements are made. The experiment recently restarted with a new target—the ninth element on the periodic table, fluorine.
Water-based process separates zirconium and...
on September 22, 2026 at 11:40 am
Oregon State University scientists have patented a better, more environmentally friendly process for separating two metals that are critical in their pure forms for the semiconductor and atomic energy industries.

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Physical

“Fundamentals”
Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

“Space”
Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid

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Notes

1. The resources on this page are are organized by a classification scheme developed exclusively for Cosma.