Column A Column B
1.
a. Group
2.
b. Period
Groups on the Periodic Table have the same
number of
Periods on the Periodic Table have the same
number of
A column (up and down) on the Periodic Table is
called a -
A row (side to side) on the Periodic Table is
called a -
3.
c. energy levels/orbitals
4.
d. valence electrons