1. (15 points) In the space provided indicate whether the following statements are true (T) or false (F) The minimum radius ration (r/R) for a coordination number of 4 is 0.225 _Carbon has three allotropic forms Aluminum alloy has an FCC structure There are 14 Bravais crystal systems, each of which belongs to one of the 14 crystal systems. The packing factor of FCC structure is greater than that of the BCC structure Metals contain amorphous regions interspersed with crystallinne regions Polymers contain amorphous regions interspersed with crystalline regions The structure of Ceramic crystals can be predicted from the relative sizes of the cation and anion and the number of cations and anions needed to maintain electrical neutrality within the unit cell Most real materials have polycrystalline structures that are composed of small crystals The coordination number for an amon in the Rocksalt (NaCl) structure is 8 You can get from sand to a cell phone by using processing that transformas raw materials into new stuff The number of neutrons in the atom is equal to the difference between the mass number of the atom and the atomic number The ne number of the atom is equal to the sum of the number of neutrona in the nucleus I like materials science and entering Type of banding dictates whether a material is electrically conductive or not