Utilities

Lewis Structure & VSEPR Predictor

Predict the Lewis dot structure, valence electrons, central atom, lone pairs, and VSEPR geometry (linear / trigonal / tetrahedral / …) of a covalent molecule.

html· HTML resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/lewis-structure-and-vsepr-predictor' \
  -H 'Content-Type: application/json' \
  -d '{"formula":"H2O","centralAtom":"e.g. S (defaults to least electronegative non-H)","charge":"0"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/lewis-structure-and-vsepr-predictor

Parameters

Name	Type	Required	Description
formula	text	Yes	—
centralAtom	text	No	—
charge	select	No	—

Response format

HTML result

JSON

{
  "result": "<div>Processed HTML content</div>",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-lewis-structure-and-vsepr-predictor": {
      "name": "lewis-structure-and-vsepr-predictor",
      "description": "Predict the Lewis dot structure, valence electrons, central atom, lone pairs, and VSEPR geometry (linear / trigonal / tetrahedral / …) of a covalent molecule.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=lewis-structure-and-vsepr-predictor",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "lewis-structure-and-vsepr-predictor",
    "arguments": {
  "formula": "H2O",
  "centralAtom": "e.g. S (defaults to least electronegative non-H)",
  "charge": "0"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

Browse tools Open tool

curl -X POST 'https://api.elysiatools.com/en/api/tools/lewis-structure-and-vsepr-predictor' \ -H 'Content-Type: application/json' \ -d '{"formula":"H2O","centralAtom":"e.g. S (defaults to least electronegative non-H)","charge":"0"}'

Name

Type

Required

Description

formula

text

Yes

—

centralAtom

text

—

charge

select

—

{ "mcpServers": { "elysiatools-lewis-structure-and-vsepr-predictor": { "name": "lewis-structure-and-vsepr-predictor", "description": "Predict the Lewis dot structure, valence electrons, central atom, lone pairs, and VSEPR geometry (linear / trigonal / tetrahedral / …) of a covalent molecule.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=lewis-structure-and-vsepr-predictor", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "lewis-structure-and-vsepr-predictor", "arguments": { "formula": "H2O", "centralAtom": "e.g. S (defaults to least electronegative non-H)", "charge": "0" } } }