5. Which of the following families of elements include the most active metals in the periodic table?
A. group 2, the alkaline earth metals
B. group 1, the alkali metals
C. group 18, the noble gases
D. group 17, the halogens

6. The vertical columns of the periodic table called _____, identify the principal families of elements.
A. groups
B. periods
C. noble gases
D. actinides

7. Elements found in group 3 to group 12 constitutes the d-block in the periodic table and are referred to as _____.
A. representative elements
B. transition elements
C. lanthanides and actinides
D. inner transition elements