Ammonium Symbol NH₄⁺

Ammonium Symbol uses NH₄⁺, the chemical formula for the ammonium ion. The encoded text sequence is U+004E U+0048 U+2084 U+207A: capital N, capital H, subscript four, and superscript plus. Each component contributes to the chemical identity and should remain in the correct position. Examples include “NH₄⁺”, “NH₄Cl → NH₄⁺ + Cl⁻”, “[NH₄⁺] concentration”, and “Ammonium ion: NH₄⁺”. The subscript states that four hydrogen atoms are present, while the superscript plus records the ion’s positive charge. Concentration values and units must be written separately from the formula. Keep NH₄⁺ distinct from neutral ammonia NH₃ and from other cations such as Na⁺. Plain text “NH4+” may be used in limited systems, but formal typesetting should preserve the subscript and superscript structure. Do not place the charge before the formula, change element capitalization, or treat the ion notation as a complete safety label. Literal Unicode text can represent the structured form, while equation or chemistry markup may provide better semantics in technical publishing. Add an accessible reading such as “N H four plus” or “ammonium ion” when the formula appears without explanatory prose. A final chemical review should confirm atom counts, charge, reaction arrows, and concentration units. Ammonium Symbol supplies the copyable formula; laboratory interpretation, hazards, and reaction conditions require separate documented information. When the formula is reused in a table, keep the charge visible in every row and avoid relying on a column heading to restore missing notation.