CEM 141 MSU Exam 3 QUESTIONS &
ANSWERS
Ionization Energy - ANSWERenergy required to remove an electron from an atom in the
gas phase
Left Side Electrons - ANSWERhave weaker attractions to remove electrons
*easier to remove electrons from the left side of the table than the right side*
Does it take MORE or LESS energy to remove an electron from Li than from Na? -
ANSWERMORE
Why? Because as we move down a group, the orbitals become larger and weaker.
While going across the effective nuclear charge increases. (holds onto the electrons
tighter)
Big Bang evidence - ANSWERuniverse is expanding (red shift)
Where do atoms come from? - ANSWERThe Big Bang
What were elements formed by? - ANSWERNuclear reactions
Chemical reactions - ANSWERinvolve rearrangements of valence electrons
*the element undergoing a chemical reaction does not ever change*
Ionization energies are affected by - ANSWER-size of an atom
-size of positive charge
Periodic Trends - ANSWER-small atoms have higher ionization energies
-they are inversely related
Atomic Radius Decreases ----> Ionization energy increases - ANSWERwhen the radius
decreases, it pulls the electrons closer. decreasing the size of an atom
Nuclear Reactions - ANSWERFusion and Fission
Fusion - ANSWERtwo lighter nuclei combines to form a heavier nucleus (energy
released)
Fission - ANSWERa heavier nucleus is broken a part to form lighter, more stable nuclei
energy
Atomic # = - ANSWER# of protons
Atomic mass = - ANSWERwhat's left over
ANSWERS
Ionization Energy - ANSWERenergy required to remove an electron from an atom in the
gas phase
Left Side Electrons - ANSWERhave weaker attractions to remove electrons
*easier to remove electrons from the left side of the table than the right side*
Does it take MORE or LESS energy to remove an electron from Li than from Na? -
ANSWERMORE
Why? Because as we move down a group, the orbitals become larger and weaker.
While going across the effective nuclear charge increases. (holds onto the electrons
tighter)
Big Bang evidence - ANSWERuniverse is expanding (red shift)
Where do atoms come from? - ANSWERThe Big Bang
What were elements formed by? - ANSWERNuclear reactions
Chemical reactions - ANSWERinvolve rearrangements of valence electrons
*the element undergoing a chemical reaction does not ever change*
Ionization energies are affected by - ANSWER-size of an atom
-size of positive charge
Periodic Trends - ANSWER-small atoms have higher ionization energies
-they are inversely related
Atomic Radius Decreases ----> Ionization energy increases - ANSWERwhen the radius
decreases, it pulls the electrons closer. decreasing the size of an atom
Nuclear Reactions - ANSWERFusion and Fission
Fusion - ANSWERtwo lighter nuclei combines to form a heavier nucleus (energy
released)
Fission - ANSWERa heavier nucleus is broken a part to form lighter, more stable nuclei
energy
Atomic # = - ANSWER# of protons
Atomic mass = - ANSWERwhat's left over
