CHEM 121 EXAM 3 REVIEW SHEET COMPLETE QUESTIONS ANSWERS GRADED A PLUS

CHEM 121 EXAM 3 REVIEW SHEET COMPLETE QUESTIONS ANSWERS GRADED A PLUS
CHEM 121 EXAM 3 Questions and Answers Verified
Solutions Latest Update 2026/2027

Question:
Core electrons are

Answer:
those below the highest energy level (those in the filled periods)



Question:
it is energetically easiest to do what to add or remove what kind of electrons?

Answer:
valence electrons



Question:
it is energetically hardest to remove what kind of electrons?

Answer:
core



Question:
as atomic radius increases,.

Answer:
electronegativity decreases



Question:
lewis dot structure

Answer:

,a representation of the valence electronic structure of an atom using one dot for each valence
electron



Question:
What is the octet rule?

Answer:
atoms in the main group strive to achieve 8 valence electrons and simulate the valence structure of
group 18 elements



Question:
Group

Answer:
A column on the periodic table



Question:
period

Answer:
A horizontal row of elements in the periodic table



Question:
oxidation number

Answer:
the charge an element acquires when it completes its octet valence electron structure



Question:
Electronegativity

Answer:

, the desire of atoms to draw electrons when they combine with other atoms



Question:
the larger the atomic radius, the harder it becomes to what?

Answer:
attract electrons to an atom



Question:
as you go down a group (column) on the periodic table, ______________________ increases, and
______________________ decreases

Answer:
atomic radii electronegativity



Question:
as you go across a period (row) on the periodic table, _________________ decreases, and
_________________ increases

Answer:
atomic radii electronegativity



Question:
what is the most electronegative element in the periodic table?

Answer:
fluorine



Question:
what group has zero electronegativity and why?

Answer: