© Pearson AGS Globe. Permission is granted to reproduce for classroom use only. Chemistry

Atomic Mass

Directions Answer each question on the lines. Use complete sentences.

1. What is an atomic mass unit?

2. What accounts for most of an atom’s mass?

3. What is the approximate mass of a neon-11 atom?

4. What equation is used to calculate atomic mass?

5. Why are atomic numbers never whole numbers?

6. What is percent abundance?

Directions Unscramble the word or words in parentheses to complete each sentence. Write the answer on the line.

7. Molar mass is the same number as ________________. (tmoiac ssma)

8. To calculate atomic mass you have to know the mass and ________________ of each isotope. (bunacaden)

9. When calculating atomic mass, ________________ can be ignored. (clrestneo)

10. Mass numbers are always ________________. (helow burmsen)

Name Date Period Workbook Activity

Chapter 8, Lesson 4 51

08_662_Chem_TRL_WA.indd 4 3/28/06 4:06:35 PM