Which nonmetal makes up diamond, graphite, and the majority of coal?

A - Oxygen

B - Sodium

C - Magnesium

D - Carbon

D-carbon

When compressed forms diamonds

Answer

D - Carbon

Explanation:

Carbon, as an element, is the basis of what is referred to as diamond, graphite, and coal. Coal is a solid form with high content of hydrocarbon making coal amenable to burning). In a much purer form Carbon occurs in graphite and diamond. While in graphite carbon atoms bond to two neighboring atoms, in diamond they do so to four neighboring carbon atoms in a "tetrahedron-like" configuration (making diamond very hard).