Until scientists invented the artificial isotopes, carbon existed in two forms - either in planar sheets of atoms, in which case it becomes a soft material and conducts electrical impulses, or three dimensional structure, which makes it the hardest known material and acts as an insulator.
a) three dimensional structure, which makes it the hardest known material and acts
b) in three dimensional structure, which makes carbon the hardest known material and acts
c) in three dimensional structure, in which case it becomes the hardest known material and acts
d) three dimensional structure, making it the hardest known material and acting
e) three dimensional structure and it becomes the hardest known material and acts![]()
a) three dimensional structure, which makes it the hardest known material and acts
b) in three dimensional structure, which makes carbon the hardest known material and acts
c) in three dimensional structure, in which case it becomes the hardest known material and acts
d) three dimensional structure, making it the hardest known material and acting
e) three dimensional structure and it becomes the hardest known material and acts