9. give the atomic number of each isotope.\na. magnesium - 25\nb. bromine - 79\nc. antimony - 121

9. give the atomic number of each isotope.\na. magnesium - 25\nb. bromine - 79\nc. antimony - 121
Answer
Brief Explanations:
The atomic number of an element is a fundamental property that does not change for its isotopes. For magnesium ((Mg)), it is always (12) regardless of the isotope (e.g., magnesium - 25). Bromine ((Br)) has an atomic number of (35) for all its isotopes (e.g., bromine - 79). Antimony ((Sb)) has an atomic number of (51) for all its isotopes (e.g., antimony - 121).
Answer:
a. (12) b. (35) c. (51)