How to Type Chemical Formulas
Typing chemical notation on a standard keyboard is difficult because elements like Carbon require subscripts (C₆), and ions require superscripts (Ca²⁺). Our tool makes this seamless.
- 1 Type the element symbol (e.g., "H") with your keyboard.
- 2 Click the subscript number (₂) from our chemistry keyboard.
- 3 Add arrows (→) or charge signs (⁺) as needed.
Common Symbol Reference
Chemistry Notation, Explained
Chemical formulas pack a lot of meaning into a few characters, and almost none of them live on a standard keyboard. Subscripts show how many atoms of an element are present — the small 2 in H₂O means two hydrogen atoms. Superscripts show electrical charge, so a calcium ion is written Ca²⁺ and a sulfate ion SO₄²⁻. Isotopes use a leading superscript for mass number, as in ²³⁵U for uranium‑235. Getting these right matters: CO (carbon monoxide) and CO₂ (carbon dioxide) are very different substances, and the only visible difference is one small subscript.
Reactions add another layer. A plain arrow → shows a reaction proceeding to products, while the double harpoon ⇌ marks a reversible equilibrium. A capital delta Δ over or beside the arrow means heat is applied, and state symbols in parentheses — (s) solid, (l) liquid, (g) gas and (aq) aqueous — tell the reader the physical form of each species. The interpunct · is used for hydrates, as in copper(II) sulfate pentahydrate, CuSO₄·5H₂O.
Common Formulas at a Glance
Where You'll Use It
Students typing up lab reports and homework, teachers building worksheets, and researchers writing papers all need clean chemical notation that survives being pasted into Word, Google Docs, email or a forum post. Because every character our chemistry keyboard produces is standard Unicode, your subscripts, superscripts and reaction arrows keep their exact form everywhere — no images, no broken formatting, and no fighting with equation editors for a simple formula.
Tips for Accurate Chemical Formulas
- • Use a true subscript for atom counts (H₂O), not a normal number, so the formula reads correctly and stays searchable.
- • Put the charge as a superscript after the element or group, with the number before the sign: Ca²⁺, PO₄³⁻.
- • Keep state symbols lowercase and in parentheses directly after each species in an equation.
- • Paste the Unicode characters directly instead of inserting images — they resize cleanly and stay accessible to screen readers.