1. Complete and balance the following:

a) ²⁵² Cf + ¹⁰ B = 3 ¹ n + ?

b) ¹²² I = ¹²² Xe + ?

c) ⁵⁹ Fe = _-1b + ?

d) ²³⁸ U = ²⁰⁶ Pb + ___ a + ___b

2.Define or describe each of the following:

a) nucleon

b) positron

c) gamma ray

d) alpha particle

e) beta particle

3. A gamma ray is a high energy beam of ______________.

a) ⁴ He nuclei b) electrons c) neutrons *d) photons e) protons

4. A radioactive decay series that begins at ²³⁷ Np and ends at ²⁰⁹ Bi produces __________ alpha particles and _______beta particles.

 5. How many neutrons, protons and electrons are there in one ⁵⁶Fe⁺³ ion?

6. Write down the nuclear reactions that describe the following processes:

a) Bi-214 undergoes beta decay

b) gold-195 undergoes electron capture

c) plutonium-242 emits an alpha particle.

d) U-238 reacts with a neutron to form plutonium 239 plus two beta particles.

e) U-235 reacts with one neutron (undergoes fission) to form Kr-91 + ?+ 3 neutrons.

 7. Write  questions like 3 for alpha and beta particles and answer them.

8.  21.5

9.  21.8

10. 21.23