Note that there are now several types of treatments and medical providers for which Medicare Part B pays 100% of the approved charges rather than the usual 80%. These categories of care include home health care, clinical laboratory services, and flu and pneumonia vaccines.
A giant covalent structure is a three dimensional structure of atoms held together (obviously) by Covalent bonds. These atoms are often all the same-so the elements Silicon and Carbon in the allotropes Diamond and Graphite are Giant Covalent structures.
(Answer: Each C atom has one F atom in the structure on the left, while the structure on. the right has both F atoms on the same C atom. These are structural isomers.) This last pair of molecules is an example of a different type of isomer. All. the atoms are bonded to the same atoms in both structures, but the F atoms. are pointed the same direction (cis or Z) in the first structure and in opposite. direction (trans or E) in the second structure.