Subscripts in a molecular indicate how many of each type

subscripts show the number of atoms of each type in the molecule.

i believe it is 40–40–20%

explanation:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.