Name: _______________________________ Period: __________
Atomic Structure Practice Test
1) What is the smallest particle of an element that retains the properties of that element?
2) What did the following scientists discover / contribute to our knowledge of the atom?
a. Democritus
b. John Dalton
c. J.J. Thompson
d. Ernest Rutherford
e. Neils Bohr
f. James Chadwick
3) Complete the following table:
Subatomic Particle
Symbol
Charge
Mass
Location
4) What is the same and what is different about isotopes of the same element?
5) Complete the following table:
Element
Symbol
Oxygen
Atomic number
Atomic Mass
Most common isotope
Sulfur
Selenium
6) The atomic number of an element is the total number of which subatomic particles in the nucleus?
7) What is the mass number of an element?
8)
How many protons, electrons, and neutrons does an atom with an atomic number 80 and a mass
number 170 contain?
Name: _______________________________ Period: __________
Atomic Structure Practice Test
9) Complete the following table:
Element
Symbol
Number of
protons
Number of
neutrons
Number of Electrons
Sodium-24
Magnesium 24
Aluminum-27
10) How many protons, electrons, and neutrons does an atom with an atomic number 50 and a mass
number 120 contain?
11) What does the number 84 in the name Krypton-84 represent? What is it’s symbol?
Element
Density (g/cm3)
Aluminum
2.70
Zinc
Iron
Copper
7.13
7.87
8.96
Gold
19.3
12) Based on this table, what is the relationship between density and atomic number?
13) Element X has two natural isotopes. The isotope with a mass of 32 amu (32X) has a relative
abundance of 29.91%. The isotope with a mass of 33 amu (33X) has a relative abundance of
70.09%. Calculate the atomic mass of this element.
14) An element has three known isotopes. The most abundant isotope has a mass of 45 amu, and a
relative abundance of 50%. The second isotope has a mass of 48 amu and a relative abundance
of 35%. The third isotope has a mass of 49 amu. Calculate the atomic mass of this element.
15) What is a rule or principle that describes what happens in nature, but does not explain why?
16) What is an explanation of an event that is based on repeated observations and experiments?