Which element is a metalloid?
a. argon (ar)
b. silicon (si)
c. potassium (k)
d. magnesium (mg)

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

What three natural resources are found in the great lakes region

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?