Asked by andrew
what is the isotope number equal too
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The isotope number (more correctly called the mass number, A) equals the total number of nucleons in the nucleus: protons + neutrons.
- A = Z + N, where Z = atomic (proton) number and N = number of neutrons.
- So N = A − Z.
Example: Carbon-14 has A = 14, Z = 6, so N = 14 − 6 = 8.
Note: mass number A is an integer and differs from the atomic mass (a measured value in atomic mass units), which can be non-integer.
- A = Z + N, where Z = atomic (proton) number and N = number of neutrons.
- So N = A − Z.
Example: Carbon-14 has A = 14, Z = 6, so N = 14 − 6 = 8.
Note: mass number A is an integer and differs from the atomic mass (a measured value in atomic mass units), which can be non-integer.
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