1. Chapter 4 Introduction to Atoms
Test Review

2. What am I best known for. 1. Bohr 2. Rutherford 3. Democritus 4
What am I best known for? 1. Bohr 2. Rutherford 3. Democritus 4. Schrodinger & Heisenberg 5. Dalton 6. Thomson
Discovering the electron
Discovering the nucleus
Electrons orbit the nucleus in energy levels
Electrons can be found in electron clouds
Atomic Theory
Coming up with the concept of the atom c b f d e a

3. 7.Proton; Nucleus 8. Isotope
7.What is the positively charged particle in an atom? Where is it located? 8. What is an atom of an element that has the same number of protons and different number of neutrons called?
7.Proton; Nucleus 8. Isotope

4. 9.Nucleus 10.Atomic Number
9. What is the region of an atom that contains the most of the mass? 10.What is determined by the number of protons in an atom?

5. 11. What is the weighted average of all the naturally occurring isotopes of an element? 12. What is the smallest particle into which an element can be divided and still be the same substance?
11.Atomic mass 12. Atom

6. 13. Electron; Electron Clouds 14. Proton; Nucleus
13. What is the negatively charged particle of an atom called? Where would it be located? 14. What is the positively charged particle of an atom called? Where would it be located?
13. Electron; Electron Clouds 14. Proton; Nucleus

7. 15. Neutron; Nucleus 16. Nucleus
15. What is a particle with no charge called? Where is it located? 16. What is the dense center of the atom called?
15. Neutron; Nucleus 16. Nucleus

8. The nucleus is:
Small or Large
Loose or Dense
Positive or Negative
Small
Dense
Positive
An atom of oxygen with 8 protons, 8 electrons, and 10 neutrons would have a mass number of? 18

9. Who has the most mass – a proton, neutron, or electron
Who has the most mass – a proton, neutron, or electron? Who has the least?
Protons and Neutrons
Electron
20. If an isotope of chlorine, chlorine-37, has 17 protons, how many protons does chlorine-35 have? 17 protons

10. 22. What is the meaning of “atom”? Not able to be divided
21.An atom of uranium with 92 protons, 143 neutrons, and 92 electrons would have a mass number of? 235
22. What is the meaning of “atom”? Not able to be divided

11. 23. Which four statements are true about isotopes?
a. Same number of protons
b. Same number of neutrons A
c. Different number of protons
d. Different number of neutrons D
e. Same atomic masses
f. Different atomic masses F
Same atomic numbers
Different atomic numbers G

12. 24. What happens if the number of electrons and protons are not equal
24. What happens if the number of electrons and protons are not equal? The atom has a charge (It’s an ION!)
25. How do you calculate mass number? Number of Protons + Number of Neutrons

13. 26. What information does the atomic number give you? Number of Protons
27. How is the atomic mass of an element calculated? Atomic mass is the weighted average of the element’s isotopes.

14. 28. What is the dense center of the atom?
Nucleus
What are the positively charged particles?
Protons
30. What are the negatively charged particles?
Electrons
31. What are the particles with no charge?
Neutrons