⚛️ Atom Calculator — Protons, Neutrons, Electrons, Z, A & Charge
Type any three values to solve the rest. Uses standard relationships:
p=Z, n=A−Z, e=Z−z, A=p+n, z=p−e.⚙️ Inputs (any three)
All fields are dimensionless counts (no physical units). Results update instantly.
📊 Quick view
Neutral?—
Ion type—
Charge units
Charge—
🧾 Detailed outputs
| Atomic number (Z) | Mass number (A) | Protons (p) | Neutrons (n) | Electrons (e) | Charge (z) |
|---|---|---|---|---|---|
| — | — | — | — | — | — |
🔣 Nuclear notation helper
Isotope/ion notation:
AZEq (E = element symbol). This box shows the structure using E as a placeholder.
Notation—
🧮 Step-by-step derivation (click to expand)
📚 Reference
| Quantity | Definition / equation |
|---|---|
| Atomic number (Z) | Number of protons |
| Mass number (A) | Total nucleons: A = p + n |
| Electrons (e) | e = Z − z (for ions) |
| Charge (z) | z = p − e |
| Neutrons (n) | n = A − Z |
| Isotope notation | AZEq |
Counts are integers (≥0 for p, n, e, Z, A; z may be negative/positive/zero).