{"uid":"cap_0FR0coMjGYG-P2RSWrrPC","slug":"periodic-table-element-lookup-api-b0e82f89","name":"Periodic Table Element Lookup API","description":"Periodic table API: complete data for any of the 118 chemical elements — look up by symbol (Fe), name (iron), or atomic number (26). Returns atomic mass, category, phase at STP, period/group, electron configuration, electronegativity, melting and boiling points, density, electron shells, and a summary. For chemistry, materials, education, and science agents. Attributed dataset.","url":"https://x402.forgemesh.io/element-lookup","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"element":{"type":"string","description":"symbol, name, or atomic number"}}},"responseSchema":{"type":"json","example":{"name":"Iron","symbol":"Fe","category":"transition metal","atomic_mass":55.845,"atomic_number":26,"melting_point_k":1811.15}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_8_hUIUdaX6a188LGuDF4R","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns comprehensive data for any of the 118 chemical elements given a symbol, name, or atomic number","exampleAgentPrompt":"What are the full properties of iron — atomic mass, melting point, electron configuration, electronegativity, and everything else from the periodic table?","exampleUseCases":null,"resultDescription":"A structured record for the requested element containing atomic mass, element category (e.g. transition metal), phase at STP (solid/liquid/gas), period and group numbers, full electron configuration string, electronegativity value, melting and boiling points (in Kelvin), density, electron shell counts, and a plain-language summary paragraph.","failureModes":["Unknown or misspelled element symbol/name returns an error or empty result","Atomic number out of range (>118 or <1) returns an error","Ambiguous input (e.g. partial name) may fail to resolve","Network or payment authorization failure returns HTTP 402 or 5xx"],"whenToPreferThis":"Use this endpoint when an agent needs authoritative, structured chemistry data for a specific element — especially when multiple properties are needed at once (mass, configuration, phase, electronegativity, etc.). Prefer over scraping Wikipedia or using an LLM's internal knowledge when accuracy and structured output are required. Ideal for chemistry education tools, materials science pipelines, and science agents that need reliable, citable element data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:55:41.465Z","isFirstParty":false}