Answer :
Final answer:
The mass number of platinum-193 is 193, which is the total of its protons and neutrons. Platinum has 78 protons, so this isotope contains 115 neutrons (193 - 78). Therefore, it comprises 78 protons and 115 neutrons, affirming the mass number of 193.
Explanation:
Understanding the Mass Number of Platinum-193
The mass number of an isotope is the total count of protons and neutrons in its nucleus. For platinum-193, this isotope specifically has a mass number of 193. This means that there are a total of 193 nucleons (which include both protons and neutrons) present in the nucleus of platinum-193.
To break it down further:
- Platinum has an atomic number of 78, which indicates it has 78 protons.
- To find the number of neutrons, you subtract the atomic number from the mass number: 193 (mass number) - 78 (atomic number) = 115 neutrons.
Thus, platinum-193 consists of 78 protons and 115 neutrons, totaling a mass number of 193.
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