1. Give the number of protons and the number of neutrons in the nucleus of the f

Question

1. Give the number of protons and the number of neutrons in the nucleus of the following isotopes:

      a)    Carbon-14

      b)    Cobalt-60

      c)    Gold-197

      d)    Uranium-235

2. Write nuclear symbols for each of the isotopes in question 1.

3. Write a nuclear equation for the beta decay of the following isotopes:

      a)    Carbon-14

      b)    Sodium-24

      c)    Lead-210

4. Write a nuclear equation for the alpha decay of the following isotopes

     a)   Thorium-232

     b)    Uranium-234

     a)    Radium-223

5. Iodine-131 has a half-life of 8 hours. If a solution containing 5 grams of iodine-131 is injected into a patient, how long will it take until the total amount of iodine-131 left in the patient is 5 g (5 micrograms)?

Explanation / Answer

1) a) p = 6 , n = 8

b) p = 27 , n = 33

c) p = 79 , n = 118

d) p = 92, n = 143

2) a) 14C6

b) 60 Co 27

c) 197 AU 79

d)235 U 92

3) 14C6 ....>   14 N 7 + 0e -1

24Na 11 ... > 24 Mg 12 + 0e -1

210 Pb 82 ...> 210 Bi 83 + 0e-1

4) a) 232Th90 ...> 228Ra88 +4He2

b) 234U92 ..> 230Th90 + 4He2

c) 223Ra88 ....> 219Rn86 +4He2

5) t1/2 = 8hr

mo = 5 g, m = 5*10^-6 g

N = Noe^(-lamda*t)

m = moe^-lamda*t

5*10^-6= 5*e^(-0.693*t/8)

t = 159 hr

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