1. lead (pb), silver (ag), and iron (fe) are examples of which of the following?

a. elements

b. molecules

c. compounds

d. all the above

2. elements can be broken down into simpler substances.

true
false

3. a substance made up of only atoms of one type is called a(n)

a. particle

b. molecule

c. element

d. compound

4. the most common element in the universe is

a. neon

b. oxygen

c. hydrogen

d. boron

5. no two elements are exactly alike.

true
false