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Chapter 2: Problem 28

Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope: (a) samarium-153, (b) lutetium-177, (c) bismuth-213, (d) molybdenum-99, (e) lead-212, (f) caesium-131.

Short Answer

Expert verified
The number of protons and neutrons for each isotope are: (a) Samarium-153: 62 protons and 91 neutrons (b) Lutetium-177: 71 protons and 106 neutrons (c) Bismuth-213: 83 protons and 130 neutrons (d) Molybdenum-99: 42 protons and 57 neutrons (e) Lead-212: 82 protons and 130 neutrons (f) Caesium-131: 55 protons and 76 neutrons

Step by step solution

01

Find the atomic number of each element

To find the atomic number (number of protons) of each element, refer to the periodic table. Atomic numbers are as follows: - Samarium (Sm): 62 - Lutetium (Lu): 71 - Bismuth (Bi): 83 - Molybdenum (Mo): 42 - Lead (Pb): 82 - Caesium (Cs): 55
02

Calculate the number of neutrons for each isotope

To find the number of neutrons in each isotope, subtract the atomic number (number of protons) from the mass number of each isotope. (a) Samarium-153 Neutrons = mass number - atomic number Neutrons = 153 - 62 Neutrons = 91 (b) Lutetium-177 Neutrons = mass number - atomic number Neutrons = 177 - 71 Neutrons = 106 (c) Bismuth-213 Neutrons = mass number - atomic number Neutrons = 213 - 83 Neutrons = 130 (d) Molybdenum-99 Neutrons = mass number - atomic number Neutrons = 99 - 42 Neutrons = 57 (e) Lead-212 Neutrons = mass number - atomic number Neutrons = 212 - 82 Neutrons = 130 (f) Caesium-131 Neutrons = mass number - atomic number Neutrons = 131 - 55 Neutrons = 76 So, the number of protons and neutrons for each isotope are: (a) Samarium-153: 62 protons and 91 neutrons (b) Lutetium-177: 71 protons and 106 neutrons (c) Bismuth-213: 83 protons and 130 neutrons (d) Molybdenum-99: 42 protons and 57 neutrons (e) Lead-212: 82 protons and 130 neutrons (f) Caesium-131: 55 protons and 76 neutrons

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