Answer
a. Gold is a metal.
b. Silicon is a metalloid.
c. Sulfur is a nonmetal.
d. Barium is a metal.
Work Step by Step
You can easily tell whether an element is a metalloid, nonmetal, or metal by looking at its position and color on the periodic table. In this book specifically, if you look at the periodic table you can see that metalloids are highlighted in green, nonmetals in blue, and all types of different highlighted in different colors.
