"Red" phosphorus is insoluble in carbon disulfide, has a broad melting range and a very low vapor pressure, and does not conduct electricity. This evidence suggests that this substance is probably:
◦ crystalline and metallic
◦ a crystal of P4 molecule units
◦ amorphous and polymeric
◦ P4+ ions in a "sea" of electrons
◦ cubic closest-packed unbonded P atoms