Chemistry Part 2 Test Review
The Atom:
Label the parts proton, neutron, electron, nucleus, electron cloud on the atom diagram below.
Electron
-
Proton
Electron Cloud
Nucleus
+
+
+
+
+
Neutron
Bohr’s Model:
Maximum number of electrons in each energy level:
___2___ 1st level
__8____ 2nd level
__18____ 3rd level
__32____ 4th and higher
Which element is this Bohr model representing?
___Magnesium________
How many valence electrons does the element have?
___2 Valence electrons__(electrons in outer shell)__
What group and period is this element in?
Group 2 (2 Valence electrons) Period 3 (3 Energy levels)
Can you have a level not be “full” before going to the next?
_____yes___________
How many valence electrons does the element have?
________2_________________________________
Is it stable or unstable?
___unstable___________
What does it mean for an element to be stable?
____unlikely to react with other elements ____________________________________________
Using Periodic Table:
What is the atomic number of cobalt? ___27______
What is the atomic mass of iodine? ___126.904_____
What are the columns called in the Periodic Table? ___Groups or Families__________
Where are most of the nonmetal elements?(circle one) Left of zigzag
Where are most of the metal elements?(circle one) Left of zigzag
Right of zigzag
Right of zigzag
On zigzag
On zigzag
What is the symbol for molybdenum? ___Mo_______
In what group can you find strontium? _Group 2________
What do the elements Barium, Gold, Platinum, and Mercury have in common? __They are all located in
Period 6, so they all have 6 energy levels with electrons in them.________________________________
What is the name of the scientist credited for developing the first periodic table? ___________________
____Mendeleev________________________________________________________________________
Determining Protons, Neutrons, and Electrons:
Which three numbers that deal with atoms are always the same number? (circle 3 below)
Atomic number
Atomic mass
# of protons
# of neutrons
# of electrons
What two numbers do you add together to get the atomic mass? (circle 2 below)
Atomic number
Atomic mass
# of protons
# of neutrons
# of electrons
Which two numbers do you subtract to find the number of neutrons? (circle 2 below)
Atomic number
Atomic mass
# of protons
# of neutrons
How many protons does mercury have? ___80____
How many neutrons does zirconium have? _ 91-40=_51
How many electrons does tin have? __50_____
How many neutrons does radon have? __222-86= 136_____
How many electrons does lanthanum have? _57______
# of electrons
How many protons does platinum have? __78_____
Electron (Lewis) Dot Diagrams:
Write the electron dot diagrams for the elements below.
Strontium
Sr
Selenium
Se
Xenon
Xe
Potassium
K
What do the dots represent around each of the symbols in the Lewis Dot Diagram?
_____The number of valence electrons the element has available for bonding with other elements.______