{"uid":"cap_gVt3A5AGgbpW3yzxVTyGh","slug":"periodic-table-element-lookup-7d214b0f","name":"Periodic Table Element Lookup","description":"Look up a periodic-table element by exactly one of `symbol` (e.g. \"Fe\"), `name` (e.g. \"iron\") or atomic `number` (1..118). Returns its number, symbol, name, standard atomic weight and whether that weight is a true standard atomic weight.","url":"https://chem.openverbs.com/v1/element","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","properties":{"name":{"type":"string","maxLength":20,"minLength":1,"description":"Element name, e.g. \"iron\"."},"number":{"type":"integer","maximum":118,"minimum":1,"description":"Atomic number."},"symbol":{"type":"string","maxLength":3,"minLength":1,"description":"Element symbol, e.g. \"Fe\"."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_s3fJ4MkV6nwieVE8SSCtO","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Look up a periodic-table element by symbol, name, or atomic number and return its atomic weight and metadata.","exampleAgentPrompt":"What is the standard atomic weight of iron? Look it up by its symbol Fe and tell me the atomic number, name, and weight.","exampleUseCases":[{"title":"Atomic weight lookup for stoichiometry","prompt":"I need the standard atomic weight of gold — look it up by symbol Au and tell me the number, name, and weight."},{"title":"Element identification by atomic number","prompt":"What element has atomic number 79? Give me its symbol, name, and standard atomic weight."},{"title":"Verify element data by full name","prompt":"Can you look up the element 'uranium' by name and tell me its atomic number, symbol, and standard atomic weight?"}],"resultDescription":"Returns the element's atomic number (integer), symbol (e.g. 'Fe'), name (e.g. 'iron'), standard atomic weight as a numeric value, and a boolean indicating whether the weight is a true standard atomic weight (as opposed to a conventional or approximate value).","failureModes":["Providing more than one lookup key (symbol, name, or number) simultaneously may result in an error or ambiguous response","Atomic number out of range 1–118 returns a validation error","Unknown or misspelled element name or symbol returns not-found error","Element symbol or name longer than allowed character limits triggers schema validation failure"],"whenToPreferThis":"Use this endpoint when you need precise, structured periodic-table data for a single known element — identified by symbol, name, or atomic number — including its verified standard atomic weight. Prefer this over a search endpoint when you already know the exact identifier. For substring or partial-name searches, use the sibling search endpoint instead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:34:35.659Z","isFirstParty":false}