Question 1
Carbon is the ________ most abundant element by mass in living organisms.
◦ first
◦ second
◦ third
◦ fourth
Question 2
What statement is inconsistent about diamond?
◦ A tetrahedral array of σ bonds with bond lengths of 154 pm.
◦ A covalent network structure in which each C atom uses
sp3 hybrid orbitals.
◦ The hardest known substance with the highest melting point for an element.
◦ When an electrical potential is applied diamond becomes a valuable semiconductor.