1. X Chapter 4 Test Review
The Atomic Theory

2. The smallest particle that still retains the property of an element is called what? A. neutron B. atom C. electron D. molecule

3. In the Schrödinger model, what is the name for where an electron is found 90% of the time?
Energy level
Isotope
Ground state
Orbital

4. The higher energy level for an electron is called what in the Bohr model? A. ground state B. orbital C. excited state D. energy level

5. What must be equal in a neutral atom?
Neutrons and protons
Electrons and neutrons
Protons and electrons

6. Atoms with a charge are called what?
Ions
Cations
Anions
Isotopes

7. In the isotope notation shown below, what does the Z and A stand for?
Z = atomic symbol, A = atomic #
Z = mass #, A = atomic #
Z = mass #, A = atomic symbol
Z = atomic #, A = mass #
Z A X

8. Who discovered the electron?
JJ Thomson
Robert Millikan
Ernest Rutherford
James Chadwick

9. Who discovered the nucleus?
JJ Thomson
Robert Millikan
Ernest Rutherford
James Chadwick

10. What is the mass number if an atom has 14 neutrons, 15 protons, and 16 electrons?45 31 30 29

11. How many protons, neutrons, and electrons are in the following sample?
p+ = 35, n = 45, e- = 80
p+ = 35, n = 80, e- = 35
p+ = 45, n = 35, e- = 45
p+ = 35, n = 45, e- = 35
8035 Br

12. How many protons, neutrons, and electrons are in the following sample?
p+ = 27, n = 32, e- = 27
p+ = 32, n = 27, e- = 32
p+ = 27, n = 32, e- = 25
p+ = 27, n = 59, e- = 25
5927 Co2+

13. What is the isotope notation for phosphorous-31?

14. What is Rutherford’s famous experiment in which he discovered the nucleus?
Oil drop experiment
Cathode ray tube experiments
Gold-foil experiment
Plum pudding experiment

15. Who is credited with the plum pudding model of the atom?
JJ Thomson
Robert Millikan
Ernest Rutherford
James Chadwick

16. Who discovered the neutron?
JJ Thomson
Robert Millikan
Ernest Rutherford
James Chadwick

17. What is the atomic number equal to?
The # of electrons in the atom
Sum of protons & neutrons in the atom
The mass number
The # of protons in the nucleus

18. What is the mass number equal to?
The # of protons in the nucleus
The sum of the protons & neutrons in the nucleus
The # of electrons in the atom
The charge on an ion

19. Which of the following are found in the nucleus of an atom?
protons
neutrons
electrons
More than one of the above
None of the above

20. Which of the following pairs below are isotopes?
Carbon-12 and Carbon-13
Uranium-238 and Neptunium-238
Chlorine-35 and Fluorine-19

21. What is the atomic mass on the periodic table equal to?
The weighted average of the masses of all naturally occurring isotopes
The sum of the protons & neutrons in the nucleus
The number of protons in the nucleus

22. Schrodinger is credited with which model of the atom?
The plum pudding model
The billiard ball model
The quantum mechanical model
The Bohr model

23. How many protons are in the nucleus of a nitrogen atom?

24. How many neutrons are in the nucleus of a Iodine-127 atom?

25. What does the 34 represent in sulfur-34?
Atomic number
Mass number
Atomic mass
Electrons in the atom

26. If an iron ion has a charge of +2, how many electrons does the ion have?