Atomic Mass of Tellurium (Te)
The relative atomic mass of Tellurium is 127.60 u — the weighted average of its naturally occurring isotopes, on the carbon-12 scale.
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Tellurium by the numbers
One Tellurium atom carries 52 protons in its nucleus; add the neutrons of its commonest isotope (about 76) and you get its mass number, roughly 128.
| Quantity | Value |
|---|---|
| Atomic number (Z) | 52 |
| Relative atomic mass | 127.60 u |
| Protons | 52 |
| Neutrons (commonest isotope) | 76 |
| Electrons | 52 |
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 (127.60). Exams love this one-mark distinction.
Students also ask
Is the atomic mass of Tellurium a whole number?
No. 127.60 u is the average of Tellurium'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 Tellurium have?
Neutrons = mass number − atomic number. For Tellurium's commonest isotope that is about 128 − 52 = 76, though the exact count differs between isotopes.