CEM 141 MSU Exam 3 Questions
with Answers
Ionization Energy - -energy required to remove an electron from an atom in
the gas phase
- Left Side Electrons - -have 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? - -MORE
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 - -universe is expanding (red shift)
- Where do atoms come from? - -The Big Bang
- What were elements formed by? - -Nuclear reactions
- Chemical reactions - -involve rearrangements of valence electrons
*the element undergoing a chemical reaction does not ever change*
- Ionization energies are affected by - --size of an atom
-size of positive charge
- Periodic Trends - --small atoms have higher ionization energies
-they are inversely related
- Atomic Radius Decreases ----> Ionization energy increases - -when the
radius decreases, it pulls the electrons closer. decreasing the size of an atom
- Nuclear Reactions - -Fusion and Fission
- Fusion - -two lighter nuclei combines to form a heavier nucleus (energy
released)
- Fission - -a heavier nucleus is broken a part to form lighter, more stable
nuclei energy
- Atomic # = - -# of protons
with Answers
Ionization Energy - -energy required to remove an electron from an atom in
the gas phase
- Left Side Electrons - -have 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? - -MORE
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 - -universe is expanding (red shift)
- Where do atoms come from? - -The Big Bang
- What were elements formed by? - -Nuclear reactions
- Chemical reactions - -involve rearrangements of valence electrons
*the element undergoing a chemical reaction does not ever change*
- Ionization energies are affected by - --size of an atom
-size of positive charge
- Periodic Trends - --small atoms have higher ionization energies
-they are inversely related
- Atomic Radius Decreases ----> Ionization energy increases - -when the
radius decreases, it pulls the electrons closer. decreasing the size of an atom
- Nuclear Reactions - -Fusion and Fission
- Fusion - -two lighter nuclei combines to form a heavier nucleus (energy
released)
- Fission - -a heavier nucleus is broken a part to form lighter, more stable
nuclei energy
- Atomic # = - -# of protons
