Atomic Mass of Nickel (Ni)
The relative atomic mass of Nickel is 58.693 u — the weighted average of its naturally occurring isotopes, on the carbon-12 scale.
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Nickel by the numbers
One Nickel atom carries 28 protons in its nucleus; add the neutrons of its commonest isotope (about 31) and you get its mass number, roughly 59.
| Quantity | Value |
|---|---|
| Atomic number (Z) | 28 |
| Relative atomic mass | 58.693 u |
| Protons | 28 |
| Neutrons (commonest isotope) | 31 |
| Electrons | 28 |
Atomic mass vs mass number
Mass number (A) counts particles — protons + neutrons in one specific atom, always a whole number. Relative atomic mass is the experimentally measured average over all natural isotopes, so it comes out fractional (58.693). Exams love this one-mark distinction.
Students also ask
Is the atomic mass of Nickel a whole number?
No. 58.693 u is the average of Nickel's natural isotopes, which is why it lands between whole numbers. The mass number of a single isotope, though, is always whole.
How many neutrons does Nickel have?
Neutrons = mass number − atomic number. For Nickel's commonest isotope that is about 59 − 28 = 31, though the exact count differs between isotopes.