NAME: _____________________________________________PERIOD: ___________ DATE: ________________________
Review Worksheet for 11.2, 12.1, 12.2
Write the term on the line that matches the definition below.
____________________ 1. Central region of the atom
____________________ 2. Atom that has the same number of protons but different number of neutrons
____________________ 3. Particle of an atom with the least mass
____________________ 4. Atom that has the same number of protons but different number of electrons
____________________ 5. Charged atom that forms when the number of electrons and protons are not equal
____________________ 6. The sum of protons in the nucleus of an atom
____________________ 7. Smallest particle into which an element can be divided and still be the same substance
Write the letter of the correct answer on the line.
_____ 8. An atom of gold with 79 protons, 79 electrons and 118 neutrons would have a mass number of
a. 39
b. 158
c. 197
d. 276
_____ 9. If an isotope of uranium-235 has 92 protons, how many protons does uranium-238 have?
a. 92
b. 95
c. 143
d. 146
Use your periodic table to fill in the tables below
Symbol
Determining Numbers of Protons, Neutrons and Electrons using the Periodic Table of Elements
# of
Metal/Metalloid
Name
Atomic Number
Atomic Mass # of Protons # of Electrons
Neutrons
or Nonmetal
Ir
Ba
Isotope Properties Table
Copper 63
Copper 65
Number of Protons
Number of Neutrons
Atomic Number
Mass Number
In the space to the right draw the element Sodium.
It has 11 protons 12 neutrons and 11 electrons