You are investigating the release kinetics of insulin-loaded microspheres. a polymeric sphere of radius 0.2cm containing a 0.1 mg/ml insulin is placed in a volume of buffer that is large enough so that the insulin concentration in the buffer at all times can be considered zero. the beaker is well mixed such that a surface concentration of zero can be assumed. the insulin diffusion coefficient in the microsphere is 5x10-8 cm2/s. determine the time required for the insulin concentration 0.1cm from the center of the sphere to equal 20% of the initial concentration.

What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.