The metals can be colored in yellow, the metalloids can be colored in purple, and the nonmetals can be colored in green.
The staircase on the periodic table is located in the upper right corner of the table, and includes the elements from boron (B) to astatine (At).
The elements and their classifications are as follows:
a. Radon: nonmetal
b. Iron: metal
c. Indium: metal
d. Polonium: metalloid
e. Krypton: nonmetal
f. Gold: metal