CHEM 120 EXAM 3 AND LAB BUNDLED
PACKAGE NEW UPDATE ACTUAL
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GRADED A+
⫸ the assignment of all of the electrons in an atom into specific shells
and subshells Answer: electron configuration
⫸ how many electrons can an s subshell hold Answer: 2
⫸ how many electrons can a p subshell hold Answer: 6
⫸ how many electrons can a d subshell hold Answer: 10
⫸ how many electrons can each orbital in an electron configuration hold
Answer: 2
⫸ two electrons in the same orbital cannot have the same spin Answer:
pauli exclusion principle
⫸ representation of the orbitals in a subshell as boxes and the electrons
in them as arrows Answer: orbital diagram
,⫸ what are the up and down arrows in an orbital diagram represented
as? Answer: the spin of the electron; either clockwise or counter
clockwise
⫸ two opposite-spin electrons in one orbital diagram are _____ Answer:
paired
⫸ electrons occupy separate orbitals in the same subshell with parallel
spins (electrons repel each other) Answer: Hund's rule
⫸ the distance from the nucleus to the outer most electrons in an atom
Answer: atomic radius
⫸ how is atomic radius usually measured Answer: in nm or pm
⫸ What's the periodic trend for atomic radius? Answer: going down a
column increases, going right to left on a row increases
⫸ the energy required to remove an electron from an atom to form a 1+
ion Answer: ionization energy
⫸ Why is ionization energy a positive value? Answer: because energy is
required for this
⫸ What's the periodic trend for ionization energy? Answer: going up a
column increases, going left to right on a row increases
, ⫸ the tendency of an atom to gain an electron to form a -1 ion Answer:
electron affinity
⫸ what's the opposite of electron affinity Answer: ionization energy
⫸ Why is electron affinity a negative value? Answer: because energy is
gained through this
⫸ What group is electron affinity positive for and why? Answer: noble
gases because they already have filled orbitals
⫸ the distance from the nucleus to the outermost electron of an ion
Answer: ionic radius
⫸ cations have a _____ charge Answer: positive
⫸ anions have a ____ charge Answer: negative
⫸ which has a bigger ionic radius? cations or anions? Answer: anions
⫸ which has a smaller ionic radius? cations or anions? Answer: cations
PACKAGE NEW UPDATE ACTUAL
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GRADED A+
⫸ the assignment of all of the electrons in an atom into specific shells
and subshells Answer: electron configuration
⫸ how many electrons can an s subshell hold Answer: 2
⫸ how many electrons can a p subshell hold Answer: 6
⫸ how many electrons can a d subshell hold Answer: 10
⫸ how many electrons can each orbital in an electron configuration hold
Answer: 2
⫸ two electrons in the same orbital cannot have the same spin Answer:
pauli exclusion principle
⫸ representation of the orbitals in a subshell as boxes and the electrons
in them as arrows Answer: orbital diagram
,⫸ what are the up and down arrows in an orbital diagram represented
as? Answer: the spin of the electron; either clockwise or counter
clockwise
⫸ two opposite-spin electrons in one orbital diagram are _____ Answer:
paired
⫸ electrons occupy separate orbitals in the same subshell with parallel
spins (electrons repel each other) Answer: Hund's rule
⫸ the distance from the nucleus to the outer most electrons in an atom
Answer: atomic radius
⫸ how is atomic radius usually measured Answer: in nm or pm
⫸ What's the periodic trend for atomic radius? Answer: going down a
column increases, going right to left on a row increases
⫸ the energy required to remove an electron from an atom to form a 1+
ion Answer: ionization energy
⫸ Why is ionization energy a positive value? Answer: because energy is
required for this
⫸ What's the periodic trend for ionization energy? Answer: going up a
column increases, going left to right on a row increases
, ⫸ the tendency of an atom to gain an electron to form a -1 ion Answer:
electron affinity
⫸ what's the opposite of electron affinity Answer: ionization energy
⫸ Why is electron affinity a negative value? Answer: because energy is
gained through this
⫸ What group is electron affinity positive for and why? Answer: noble
gases because they already have filled orbitals
⫸ the distance from the nucleus to the outermost electron of an ion
Answer: ionic radius
⫸ cations have a _____ charge Answer: positive
⫸ anions have a ____ charge Answer: negative
⫸ which has a bigger ionic radius? cations or anions? Answer: anions
⫸ which has a smaller ionic radius? cations or anions? Answer: cations
