a. Phosphorous-32

Phosphorous has an atomic number of 15, which means it has 15 protons.
The isotope Phosphorous-32 has a mass number of 32, which means it has 32 total protons and neutrons.

Number of protons: 15
Number of neutrons: 32 - 15 = 17

b. Chromium-51

Chromium has an atomic number of 24, which means it has 24 protons.
The isotope Chromium-51 has a mass number of 51, which means it has 51 total protons and neutrons.

Number of protons: 24
Number of neutrons: 51 - 24 = 27

c. Cobalt-60

Cobalt has an atomic number of 27, which means it has 27 protons.
The isotope Cobalt-60 has a mass number of 60, which means it has 60 total protons and neutrons.

Number of protons: 27
Number of neutrons: 60 - 27 = 33

d. Technetium-99

Technetium has an atomic number of 43, which means it has 43 protons.
The isotope Technetium-99 has a mass number of 99, which means it has 99 total protons and neutrons.

Number of protons: 43
Number of neutrons: 99 - 43 = 56

e. Iodine-131

Iodine has an atomic number of 53, which means it has 53 protons.
The isotope Iodine-131 has a mass number of 131, which means it has 131 total protons and neutrons.

Number of protons: 53
Number of neutrons: 131 - 53 = 78

f. Thallium-201

Thallium has an atomic number of 81, which means it has 81 protons.
The isotope Thallium-201 has a mass number of 201, which means it has 201 total protons and neutrons.

Number of protons: 81
Number of neutrons: 201 - 81 = 120

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