export interface IElement {
    name: string;
    radius: number;
}
export type TPeriodicTable = Record<string, IElement>;
/**
 * Layout and visual grouping for the periodic-table s, p, d, and f blocks.
 * Here `f` covers the complete detached lanthanide and actinide series.
 */
export type ElementBlock = "s" | "p" | "d" | "f";
/**
 * @description Chemical-element data plus conventional periodic-table
 * placement. `period` and `group` describe the chemistry; `row` and `column`
 * are one-based UI grid coordinates. The detached lanthanide and actinide
 * series use rows 8 and 9, columns 3–17, with `group: null`.
 *
 * @example
 * ```ts
 * const carbon = PeriodicTableElements.find(({ symbol }) => symbol === "C");
 * // carbon?.period === 2; carbon?.group === 14
 * // carbon?.row === 2; carbon?.column === 14
 * ```
 */
export interface PeriodicTableElement extends IElement {
    /** Standard chemical symbol, for example `"C"` or `"Fe"`. */
    readonly symbol: string;
    /** Atomic number, from 1 for hydrogen through 118 for oganesson. */
    readonly atomicNumber: number;
    /** Horizontal period in the chemical periodic table, from 1 through 7. */
    readonly period: number;
    /**
     * International Union of Pure and Applied Chemistry (IUPAC) group from
     * 1 through 18, or `null` for the detached f-block.
     */
    readonly group: number | null;
    /** Periodic-table block classification used for layout and visual grouping. */
    readonly block: ElementBlock;
    /** One-based visual row; rows 8 and 9 hold the detached f-block. */
    readonly row: number;
    /** One-based visual column in the conventional 18-column layout. */
    readonly column: number;
}
/**
 * Neutral-atom van der Waals radii in Å. The values are the surface radii
 * published by Charry & Tkatchenko (JCTC 2024, DOI 10.1021/acs.jctc.4c00784),
 * converted from bohr. Keeping these separate from the covalent radii below is
 * important: Spacefill is a physical size model, not a scaled bond model.
 */
export declare const VanDerWaalsRadii: Readonly<Record<string, number>>;
/** Normalize aromatic/lowercase element symbols to standard notation. */
export declare function normalizeElement(element: string): string;
export declare function getVanDerWaalsRadius(element: string): number;
export declare function isMetalElement(element: string): boolean;
export declare const PeriodicTable: TPeriodicTable;
/**
 * @description Complete element catalog in atomic-number order. Each frozen
 * entry carries one-based coordinates for the conventional 18-column layout.
 * The f-block—the lanthanide and actinide series commonly drawn below the main
 * table—occupies rows 8 and 9. The array and every entry are frozen at runtime.
 *
 * @example
 * ```ts
 * const iron = PeriodicTableElements.find(({ symbol }) => symbol === "Fe");
 * console.log(iron?.atomicNumber, iron?.row, iron?.column); // 26, 4, 8
 * ```
 */
export declare const PeriodicTableElements: readonly PeriodicTableElement[];