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 73–96 of 118 documents

Document	Version
Osmium Osmium (Os) is chemical element 76, a transition metal in group 8, period 6 (PubChem).	v1
Oxygen Oxygen (O) is chemical element 8, a nonmetal in group 16, period 2 (PubChem).	v1
Palladium Palladium (Pd) is chemical element 46, a transition metal in group 10, period 5 (PubChem).	v1
Phosphorus Phosphorus (P) is chemical element 15, a nonmetal in group 15, period 3 (PubChem).	v1
Platinum Platinum (Pt) is chemical element 78, a transition metal in group 10, period 6 (PubChem).	v1
Plutonium Plutonium (Pu) is chemical element 94, an actinide in the f-block, period 7 (PubChem).	v1
Polonium Polonium (Po) is chemical element 84, a metalloid in group 16, period 6 (PubChem).	v1
Potassium Potassium (K) is chemical element 19, an alkali metal in group 1, period 4 (PubChem).	v1
Praseodymium Praseodymium (Pr) is chemical element 59, a lanthanide in the f-block, period 6 (PubChem).	v1
Promethium Promethium (Pm) is chemical element 61, a lanthanide in the f-block, period 6 (PubChem).	v1
Protactinium Protactinium (Pa) is chemical element 91, an actinide in the f-block, period 7 (PubChem).	v1
Radium Radium (Ra) is chemical element 88, an alkaline earth metal in group 2, period 7 (PubChem).	v1
Radon Radon (Rn) is chemical element 86, a noble gas in group 18, period 6 (PubChem).	v1
Rhenium Rhenium (Re) is chemical element 75, a transition metal in group 7, period 6 (PubChem).	v1
Rhodium Rhodium (Rh) is chemical element 45, a transition metal in group 9, period 5 (PubChem).	v1
Roentgenium Roentgenium (Rg) is chemical element 111, a transition metal in group 11, period 7 (PubChem).	v1
Rubidium Rubidium (Rb) is chemical element 37, an alkali metal in group 1, period 5 (PubChem).	v1
Ruthenium Ruthenium (Ru) is chemical element 44, a transition metal in group 8, period 5 (PubChem).	v1
Rutherfordium Rutherfordium (Rf) is chemical element 104, a transition metal in group 4, period 7 (PubChem).	v1
Samarium Samarium (Sm) is chemical element 62, a lanthanide in the f-block, period 6 (PubChem).	v1
Scandium Scandium (Sc) is chemical element 21, a transition metal in group 3, period 4 (PubChem).	v1
Seaborgium Seaborgium (Sg) is chemical element 106, a transition metal in group 6, period 7 (PubChem).	v1
Selenium Selenium (Se) is chemical element 34, a nonmetal in group 16, period 4 (PubChem).	v1
Silicon Silicon (Si) is chemical element 14, a metalloid in group 14, period 3 (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.

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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