Most of an atom is empty space.
a. true
b. false

True because there is a lot of space between the nucleus and the electrons of the atom

 Yes, the vast majority of an atom is indeed empty space. Most of it's mass is centered in the nucleus. Flying around the nucleus are the electrons, but they're very very far away (on an atomic level anyway). Most of the atom is the space between the nucleus and the electrons.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up