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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) phosphorus-32,(b) chromium-51, (c) cobalt--60, (d) technetium-99, (e) iodine-131, (f) thallium-201.

Short Answer

Expert verified
The number of protons and neutrons in each isotope are as follows: (a) Phosphorus-32: 15 protons and 17 neutrons (b) Chromium-51: 24 protons and 27 neutrons (c) Cobalt-60: 27 protons and 33 neutrons (d) Technetium-99: 43 protons and 56 neutrons (e) Iodine-131: 53 protons and 78 neutrons (f) Thallium-201: 81 protons and 120 neutrons

Step by step solution

01

Look up the Atomic Numbers

Using a periodic table, find the atomic number (number of protons) for each element: (a) Phosphorus (P) - Atomic Number: 15 (b) Chromium (Cr) - Atomic Number: 24 (c) Cobalt (Co) - Atomic Number: 27 (d) Technetium (Tc) - Atomic Number: 43 (e) Iodine (I) - Atomic Number: 53 (f) Thallium (Tl) - Atomic Number: 81
02

Find the Number of Neutrons in Each Isotope

Subtract the atomic number from the mass number (isotope number) to find the number of neutrons: (a) Phosphorus-32: 32 - 15 = 17 neutrons (b) Chromium-51: 51 - 24 = 27 neutrons (c) Cobalt-60: 60 - 27 = 33 neutrons (d) Technetium-99: 99 - 43 = 56 neutrons (e) Iodine-131: 131 - 53 = 78 neutrons (f) Thallium-201: 201 - 81 = 120 neutrons
03

Write the Final Answer

Present the number of protons and neutrons for each isotope: (a) Phosphorus-32: 15 protons and 17 neutrons (b) Chromium-51: 24 protons and 27 neutrons (c) Cobalt-60: 27 protons and 33 neutrons (d) Technetium-99: 43 protons and 56 neutrons (e) Iodine-131: 53 protons and 78 neutrons (f) Thallium-201: 81 protons and 120 neutrons

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