Question

1. What makes carbon such a unique element?

A Carbon forms covalent bonds rather than ionic bonds
B Carbon has two stable isotopes, carbon-12 and carbon-13
C. Elemental carbon comes in two forms, diamond and graphite
D To a greater extent than any other element carbon can bond itself to form straight
chains, branched chains and rings​

Answer 1

Carbon plays a unique role among the chemical elements. ... Due to its four valence electrons, carbon is the smallest element that is able to make covalent bonds to four different atoms in its neutral form.