SOLUTIONS TO EXERCISES, LESSON 2

1. A simple substance that cannot be broken down by chemical means (i.e., oxygen). (para 2-2b)

2. positive (para 2-3)

3. negatively (para 2-3)

4. Bonding atoms combine with each other to form molecules. (para 2-5b)

5. x-ray photons (para 2-6)

6. air, an x-ray film, or living tissue (para 2-6)

7. The atom will be destroyed and the photon will release or expend its energy.(para 2-6a)

8. photo-electron (para 2-6a(2))

9. 18 to 45 days of gestation (para 2-7b(3))

10. c (para 2-2d)

11. g (para 2-2c)

12. e (para 2-2e)

13. a (para 2-3)

14. b (para 2-4)

15. f (para 2-7a)

16. d (para 2-6b(2)(b))