Periodic table of the elements

Properties of all 118 chemical elements from the PubChem periodic table, published by NCBI at the US National Institutes of Health (a US government work). One document per element citing its PubChem element page; group and period numbers come from PubChem's element annotations.

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Documents

Showing 97–118 of 118 documents

Document	Version
Silver Silver (Ag) is chemical element 47, a transition metal in group 11, period 5 (PubChem).	v1
Sodium Sodium (Na) is chemical element 11, an alkali metal in group 1, period 3 (PubChem).	v1
Strontium Strontium (Sr) is chemical element 38, an alkaline earth metal in group 2, period 5 (PubChem).	v1
Sulfur Sulfur (S) is chemical element 16, a nonmetal in group 16, period 3 (PubChem).	v1
Tantalum Tantalum (Ta) is chemical element 73, a transition metal in group 5, period 6 (PubChem).	v1
Technetium Technetium (Tc) is chemical element 43, a transition metal in group 7, period 5 (PubChem).	v1
Tellurium Tellurium (Te) is chemical element 52, a metalloid in group 16, period 5 (PubChem).	v1
Tennessine Tennessine (Ts) is chemical element 117, a halogen in group 17, period 7 (PubChem).	v1
Terbium Terbium (Tb) is chemical element 65, a lanthanide in the f-block, period 6 (PubChem).	v1
Thallium Thallium (Tl) is chemical element 81, a post-transition metal in group 13, period 6 (PubChem).	v1
Thorium Thorium (Th) is chemical element 90, an actinide in the f-block, period 7 (PubChem).	v1
Thulium Thulium (Tm) is chemical element 69, a lanthanide in the f-block, period 6 (PubChem).	v1
Tin Tin (Sn) is chemical element 50, a post-transition metal in group 14, period 5 (PubChem).	v1
Titanium Titanium (Ti) is chemical element 22, a transition metal in group 4, period 4 (PubChem).	v1
Tungsten Tungsten (W) is chemical element 74, a transition metal in group 6, period 6 (PubChem).	v1
Uranium Uranium (U) is chemical element 92, an actinide in the f-block, period 7 (PubChem).	v1
Vanadium Vanadium (V) is chemical element 23, a transition metal in group 5, period 4 (PubChem).	v1
Xenon Xenon (Xe) is chemical element 54, a noble gas in group 18, period 5 (PubChem).	v1
Ytterbium Ytterbium (Yb) is chemical element 70, a lanthanide in the f-block, period 6 (PubChem).	v1
Yttrium Yttrium (Y) is chemical element 39, a transition metal in group 3, period 5 (PubChem).	v1
Zinc Zinc (Zn) is chemical element 30, a transition metal in group 12, period 4 (PubChem).	v1
Zirconium Zirconium (Zr) is chemical element 40, a transition metal in group 4, period 5 (PubChem).	v1

Source, review, and usage

Published on Koskamo by: Koskamo
Version: 119
Documents: 118 documents
Reviewed: 2026-10-04
Last approved change: 2026-10-04
Agent lookups: 5 in the last 90 days
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem
Review status: Published by Koskamo; proposed revisions require Koskamo approval

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

Use this dataset from an agent

Agents can query it without an account. POST to /api/v1/retrieve, or connect an MCP client and call koskamo_retrieve with dataset: "periodic-table".

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retrieve request

curl --fail-with-body 'https://koskamo.com/api/v1/retrieve' -H 'Content-Type: application/json' --data-raw '{"query":"Iron","dataset":"periodic-table","top_k":3}'

Change history

Every change that reached this dataset. Proposals from contributors land only after Koskamo approves them.

Published by Koskamo2026-10-04
Oganesson · v1
Published by Koskamo2026-10-04
Tennessine · v1
Published by Koskamo2026-10-04
Livermorium · v1
Published by Koskamo2026-10-04
Moscovium · v1
Published by Koskamo2026-10-04
Flerovium · v1
Published by Koskamo2026-10-04
Nihonium · v1
Published by Koskamo2026-10-04
Copernicium · v1
Published by Koskamo2026-10-04
Roentgenium · v1
Published by Koskamo2026-10-04
Darmstadtium · v1
Published by Koskamo2026-10-04
Meitnerium · v1