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 49–72 of 118 documents

Document	Version
Iron Iron (Fe) is chemical element 26, a transition metal in group 8, period 4 (PubChem).	v1
Krypton Krypton (Kr) is chemical element 36, a noble gas in group 18, period 4 (PubChem).	v1
Lanthanum Lanthanum (La) is chemical element 57, a lanthanide in the f-block, period 6 (PubChem).	v1
Lawrencium Lawrencium (Lr) is chemical element 103, an actinide in group 3, period 7 (PubChem).	v1
Lead Lead (Pb) is chemical element 82, a post-transition metal in group 14, period 6 (PubChem).	v1
Lithium Lithium (Li) is chemical element 3, an alkali metal in group 1, period 2 (PubChem).	v1
Livermorium Livermorium (Lv) is chemical element 116, a post-transition metal in group 16, period 7 (PubChem).	v1
Lutetium Lutetium (Lu) is chemical element 71, a lanthanide in group 3, period 6 (PubChem).	v1
Magnesium Magnesium (Mg) is chemical element 12, an alkaline earth metal in group 2, period 3 (PubChem).	v1
Manganese Manganese (Mn) is chemical element 25, a transition metal in group 7, period 4 (PubChem).	v1
Meitnerium Meitnerium (Mt) is chemical element 109, a transition metal in group 9, period 7 (PubChem).	v1
Mendelevium Mendelevium (Md) is chemical element 101, an actinide in the f-block, period 7 (PubChem).	v1
Mercury Mercury (Hg) is chemical element 80, a transition metal in group 12, period 6 (PubChem).	v1
Molybdenum Molybdenum (Mo) is chemical element 42, a transition metal in group 6, period 5 (PubChem).	v1
Moscovium Moscovium (Mc) is chemical element 115, a post-transition metal in group 15, period 7 (PubChem).	v1
Neodymium Neodymium (Nd) is chemical element 60, a lanthanide in the f-block, period 6 (PubChem).	v1
Neon Neon (Ne) is chemical element 10, a noble gas in group 18, period 2 (PubChem).	v1
Neptunium Neptunium (Np) is chemical element 93, an actinide in the f-block, period 7 (PubChem).	v1
Nickel Nickel (Ni) is chemical element 28, a transition metal in group 10, period 4 (PubChem).	v1
Nihonium Nihonium (Nh) is chemical element 113, a post-transition metal in group 13, period 7 (PubChem).	v1
Niobium Niobium (Nb) is chemical element 41, a transition metal in group 5, period 5 (PubChem).	v1
Nitrogen Nitrogen (N) is chemical element 7, a nonmetal in group 15, period 2 (PubChem).	v1
Nobelium Nobelium (No) is chemical element 102, an actinide in the f-block, period 7 (PubChem).	v1
Oganesson Oganesson (Og) is chemical element 118, a noble gas in group 18, 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