1. Ch. 4 Clicker Review

2. Calculate the average atomic mass of a sample that is 80% Fe-55 and 20% Fe-56.
B. 55.8
C. 55.2
D. 55.0 

3. Nitrogen- 16 has ___ neutrons and ___ protons
A. 9,7
B. 7,9
C. 16,7
D. 7,16

4. What is the correct notation for Platinum-195?
A Pt
B Pt
C Pt
D Pt
195 95 78
195 95
195 
195 78

5. This is the nucleus of what element?
A. Carbon
B. Lithium
C. Helium
D. Nitrogen 

6. A neutral atom of an element has the same number of ____ as protons.
A. neutrons
B. electrons
C. neutrons and electrons
D. particles 

7. Which of the following agrees with Dalton’s Atomic Theory?
A. All atoms of a particular element are identical.
B. Atoms can be created and destroyed in chemical reactions.
C. Atoms combine in non-whole number ratios.
D. Atoms cannot be separated from other atoms.
But he was wrong!

8. Isotopes of an element differ in the number of
A. electrons
B. protons
C. neutrons
D. alpha particles 

9. What particle has a negative charge and is about 1/2000th the mass of a proton?
A. neutron
B. proton
C. electron
D. alpha particle 

10. What did J.J. Thompson discover that were later called electrons?
A. positive particles he called corpuscles
B. negative particles he called corpuscles
C. neutral particles he called corpuscles
D. negative particles he called neutrons 

11. The relative masses of protons, neutrons and electrons, respectively, are
A. 1, 1, 1/1840
B. 1, 1/1840, 1
C. 1/1840, 1, 1
D. 1, 1/1840, 1/1840

12. What are the number of protons, neutrons, and electrons in an isotope of Pt-195?
A. 78 p+, 78 e-, 78 n0
B. 195 p+, 195 e-, 78 n0
C. 78 p+, 78 e-, 117 n0
D. 195 p+, 195 e-, 117 n0 

13. The atomic number is always equal to the number of
A. electrons
B. neutrons
C. protons and electrons
D. protons 

14. When compared to Carbon-12, Carbon-13 has more
A. protons
B. energy levels
C. electrons
D. neutrons 

15. The average atomic mass of an element is determined by
A. the weighted average of it’s neutrons
B. the weighted average of it’s atomic number
C. the weighted average of its mass number
D. the weighted average of its naturally occurring isotopes 

16. A neutral atom of neon has
A. 10 protons, 10 electrons and 10 neutrons
B. 10 protons, 10 electrons and 20 neutrons
C. 20 protons, 20 electrons and 10 neutrons
D. 10 protons, 10 electrons and 0 neutrons

17. The atomic mass on the periodic table is not a whole number because it is dependent on each isotope’s
A. atomic number
B. atomic nucleus
C. atomic mass
D. relative abundance 

18. Millikan’s oil drop experiment led to the discovery of the charge of an electron and the electron’s
A. mass
B. electronic signature
C. cathode ray deflection
D. name

19. What were J.J. Thompson’s “corpuscles” later called?
A. protons
B. neutrons
C. electrons
D. alpha particles 

20. The nucleus of an atom contains most of the ___ of the atom and has a ____ charge.
A. mass, negative
B. mass, positive
C. charge, positive
D. space, positive 

21. How many neutrons are in this isotope?6 14 12 8 

22. Atoms are mostly ___ space where the ___ reside.
A. empty, electrons
B. empty, protons
C. positive, electrons
D. neutral, neutrons

23. What makes an element an isotope?
A. different numbers of protons
B. different numbers of neutrons
C. different numbers of electrons
D. different numbers of alpha particles 

24. Which experiment determined that the nucleus was tiny, massive and had a positive charge?
A. Rutherford’s
B. Milikan’s
C. J.J. Thompson’s
D. Chadwick’s

25. Isotopes of an element must always have the same number of
A. protons
B. neutrons
C. protons and neutrons
D. electrons

26. The locations of protons, neutrons and electrons, respectively, are
A. nucleus, nucleus, nucleus
B. energy levels outside the nucleus, nucleus, nucleus
C. nucleus, nucleus, energy levels outside the nucleus
D. nucleus, energy levels outside the nucleus, nucleus 

27. The atomic number of Gold-197 is