University:
Glendale Community College
Course:
CHM130 | Fundamental Chemistry
Academic year:

2019
Views:

144

Pages:

2
Author:

boltakvf

Worksheet for Chapter 4 on Atoms. 1. Which scientist discovered the electron? 2. Which scientist said atoms can combine to form compounds? 3. Which scientist discovered the nucleus? 4. Which subatomic particles are in the nucleus of the atom? 5. Which subatomic particle has a negative charge? 6. Write atomic notation for silicon-29 and iodine-127. How many neutrons are in each? 7. True or False? Isotopes are atoms of the same element with different masses. 8. True or False? Isotopes have the same number of neutrons. 9. How many atoms are in Al2(SO4)3? 10. Fill in this table: isotope calcium-42 bromine-81 argon-40 mass number protons electrons neutrons Answers 1. Thomson 2. Dalton 3. Rutherford 4. Protons and neutrons 5. Electron 6. 29 Si has 15 neutrons and 14 127 53 I has 74 neutrons 7. True 8. False 9. 17 isotope 10. mass number protons electrons neutrons calcium-42 42 20 20 22 bromine-81 81 35 35 46 argon-40 40 18 18 22