CHEM 219 MODULES EXAM WITH
COMPREHENSIVE QUESTIONS AND
CORRECT ANSWERS |2026 LATEST
EXAM WITH COMPLETE SOLUTION
1. What property allows metals to conduct electricity?
Fixed electrons
Covalent bonds
Delocalized electrons
Ionic bonds
2. Describe what is meant by the term 'weighted average' in the context of
atomic mass.
The term 'weighted average' indicates that all isotopes have equal
mass.
The term 'weighted average' is used to describe the mass of a single
isotope only.
The term 'weighted average' refers to the average mass of an
element's isotopes, taking into account their relative abundances.
The term 'weighted average' means the mass is calculated without
considering isotopes.
3. If an atom has the electron configuration of 1s² 2s² 2p⁶, what can you infer
about its chemical reactivity?
It is likely to be stable and less reactive due to a full outer shell.
, It will form ionic bonds with other atoms.
It will readily lose electrons and become highly reactive.
It has an incomplete outer shell and will easily gain electrons.
4. The atomic mass of an element is the weighted average mass of:
All of an element's naturally occurring isotopes
, Just the element's least abundant isotopes
Just the element's most abundant isotope
5. Describe the process that occurs during ionic bonding between metals
and non-metals.
Ionic bonding involves the transfer of electrons from metals to
non-metals, resulting in the formation of cations and anions.
Ionic bonding is the attraction between two metals due to their
similar electronegativities.
Ionic bonding involves the fusion of atoms to create a new element.
Ionic bonding occurs when two non-metals share electrons equally.
6. What does percentage composition by mass represent in a chemical
compound?
The total mass of the compound divided by the number of
elements.
The mass fraction of each element in a compound expressed as a
percentage.
The ratio of the mass of the compound to its volume.
The average atomic mass of the elements in a compound.
7. Describe why the atomic radius increases as you move down a group in the
periodic table.
The atomic radius increases due to the loss of electrons.
The atomic radius increases due to the addition of electron shells.
The atomic radius decreases because of increased nuclear charge.
The atomic radius remains constant due to stable electron
configurations.
COMPREHENSIVE QUESTIONS AND
CORRECT ANSWERS |2026 LATEST
EXAM WITH COMPLETE SOLUTION
1. What property allows metals to conduct electricity?
Fixed electrons
Covalent bonds
Delocalized electrons
Ionic bonds
2. Describe what is meant by the term 'weighted average' in the context of
atomic mass.
The term 'weighted average' indicates that all isotopes have equal
mass.
The term 'weighted average' is used to describe the mass of a single
isotope only.
The term 'weighted average' refers to the average mass of an
element's isotopes, taking into account their relative abundances.
The term 'weighted average' means the mass is calculated without
considering isotopes.
3. If an atom has the electron configuration of 1s² 2s² 2p⁶, what can you infer
about its chemical reactivity?
It is likely to be stable and less reactive due to a full outer shell.
, It will form ionic bonds with other atoms.
It will readily lose electrons and become highly reactive.
It has an incomplete outer shell and will easily gain electrons.
4. The atomic mass of an element is the weighted average mass of:
All of an element's naturally occurring isotopes
, Just the element's least abundant isotopes
Just the element's most abundant isotope
5. Describe the process that occurs during ionic bonding between metals
and non-metals.
Ionic bonding involves the transfer of electrons from metals to
non-metals, resulting in the formation of cations and anions.
Ionic bonding is the attraction between two metals due to their
similar electronegativities.
Ionic bonding involves the fusion of atoms to create a new element.
Ionic bonding occurs when two non-metals share electrons equally.
6. What does percentage composition by mass represent in a chemical
compound?
The total mass of the compound divided by the number of
elements.
The mass fraction of each element in a compound expressed as a
percentage.
The ratio of the mass of the compound to its volume.
The average atomic mass of the elements in a compound.
7. Describe why the atomic radius increases as you move down a group in the
periodic table.
The atomic radius increases due to the loss of electrons.
The atomic radius increases due to the addition of electron shells.
The atomic radius decreases because of increased nuclear charge.
The atomic radius remains constant due to stable electron
configurations.
