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.

Browse 118 documents Use with your agent

Documents

Showing 1–24 of 118 documents

Document	Version
Actinium Actinium (Ac) is chemical element 89, an actinide in the f-block, period 7 (PubChem).	v1
Aluminum Aluminum (Al) is chemical element 13, a post-transition metal in group 13, period 3 (PubChem).	v1
Americium Americium (Am) is chemical element 95, an actinide in the f-block, period 7 (PubChem).	v1
Antimony Antimony (Sb) is chemical element 51, a metalloid in group 15, period 5 (PubChem).	v1
Argon Argon (Ar) is chemical element 18, a noble gas in group 18, period 3 (PubChem).	v1
Arsenic Arsenic (As) is chemical element 33, a metalloid in group 15, period 4 (PubChem).	v1
Astatine Astatine (At) is chemical element 85, a halogen in group 17, period 6 (PubChem).	v1
Barium Barium (Ba) is chemical element 56, an alkaline earth metal in group 2, period 6 (PubChem).	v1
Berkelium Berkelium (Bk) is chemical element 97, an actinide in the f-block, period 7 (PubChem).	v1
Beryllium Beryllium (Be) is chemical element 4, an alkaline earth metal in group 2, period 2 (PubChem).	v1
Bismuth Bismuth (Bi) is chemical element 83, a post-transition metal in group 15, period 6 (PubChem).	v1
Bohrium Bohrium (Bh) is chemical element 107, a transition metal in group 7, period 7 (PubChem).	v1
Boron Boron (B) is chemical element 5, a metalloid in group 13, period 2 (PubChem).	v1
Bromine Bromine (Br) is chemical element 35, a halogen in group 17, period 4 (PubChem).	v1
Cadmium Cadmium (Cd) is chemical element 48, a transition metal in group 12, period 5 (PubChem).	v1
Calcium Calcium (Ca) is chemical element 20, an alkaline earth metal in group 2, period 4 (PubChem).	v1
Californium Californium (Cf) is chemical element 98, an actinide in the f-block, period 7 (PubChem).	v1
Carbon Carbon (C) is chemical element 6, a nonmetal in group 14, period 2 (PubChem).	v1
Cerium Cerium (Ce) is chemical element 58, a lanthanide in the f-block, period 6 (PubChem).	v1
Cesium Cesium (Cs) is chemical element 55, an alkali metal in group 1, period 6 (PubChem).	v1
Chlorine Chlorine (Cl) is chemical element 17, a halogen in group 17, period 3 (PubChem).	v1
Chromium Chromium (Cr) is chemical element 24, a transition metal in group 6, period 4 (PubChem).	v1
Cobalt Cobalt (Co) is chemical element 27, a transition metal in group 9, period 4 (PubChem).	v1
Copernicium Copernicium (Cn) is chemical element 112, a transition metal in group 12, period 7 (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".

Set up your agent Read documents as JSON

The JSON endpoint returns document text and source links in pages. Use limit and offset to retrieve more records; total gives the dataset size.

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