Question

Families 1-2 and 13-18 are called the...

A. transition elements.
B. radioactive elements.
C. representative elements.
D. rare earth elements.

Answer 1

C. representative elements.

Step-by-step explanation:

Families 1 - 2 and 13 - 18 are called representative elements or often times, main group elements.

• Elements on the periodic table belongs to four blocks which are s, p, d and f blocks.
• Those in the s and p-blocks are the main group elements also called representative elements.
• Their outer-shell are not completely filled with electrons but their inner shell is completely filled.