Test Recovery Strategy
Complete the following problems for up to half points back on your last test. If you are struggling to complete these
questions and you need help, come in for tutoring!
Complete the table.
Element
Symbol
Full Electron Configuration
Lithium
Mg
Selenium
Ruthenium
Cs
Nickel
Explain Aufbau’s Principle:
Explain the Octet Rule:
Explain how Ionic Bonding occurs. What is happening to the electrons? What is making the bond?
Determine whether the following atoms will gain or lose electrons, how many they will gain or lose, and what their
resulting charge will be.
Atom
Beryllium
Cesium
Phosphorus
Chlorine
Iodine
Helium
Boron
Gain/Lose
How many?
Resulting charge
Determine what types of bonds are formed between the following atoms. (Ionic, Polar covalent, Non-polar covalent)
and indicate what is happening to their electrons. (Shared equally, Shared unequally, Transferred)
Atoms
Math
Type of Bond
Electrons
Boron and Oxygen
Lithium and Chlorine
Carbon and Hydrogen
Hydrogen and
Hydrogen
Cesium and Bromine
Silicon and Phosphorus
Identify each of the following properties as belonging to an Ionic (I), Covalent (C), or Metallic (M) compound.
____ Forms a crystal lattice structure
____ Is difficult to crush
____ Is easy to crush
____ Has a high melting point
____ Is easy to melt
____ Salt
____ Conducts electricity as a solid and a liquid
____ Is a liquid or gas at room temperature
____ Conducts electricity as a liquid
____ Has a “sea of electrons”
For the following formulas, draw a Lewis Structure, determine the shape of the molecule based on VSEPR theory, and
identify whether the molecule is polar or non-polar.
1)
PBr3
Shape: ______________________
Polar/Non-polar
2)
N2H2
Shape: _____________________
Polar/Non-polar
3)
NO2-1
Shape: ______________________
Polar/Non-polar
4)
C2H4
Shape: _________________________
Polar/Non-polar
5)
CCl4
Shape: ________________________
Polar/Non-polar
6)
BH3
Shape: ________________________
Polar/Non-polar
7)
SiS2
Shape: ________________________
Polar/Non-polar
8)
C2H2
Shape: ________________________
Polar/Non-polar
9)
PF3
Shape: _________________________
Polar/Non-polar
Explain why water is classified as a POLAR COVALENT molecule in terms of electronegativity, bond polarity and
molecular polarity.