7.37 A thin cylindrical disk of genetically transformed hepatocytes 2.5cm in diameter is suspended in a nutrient solution at 37°C. The nutrient solution has a density of 1 g cm−3 and a viscosity of 0.0012 Pa s. The oxygen diffusivity in the nutrient solution was found to be 2.5 × 10−5 cm2 s−1. The half-thickness of the disk (δ) that contains the cells is 150 μm, and the cell fraction is 0.35. The consumption rate of oxygen on a per cell volume basis by these cells is 18.5 μM s−1. If the pO2 of oxygen in the bulk nutrient solution is 150 mmHg, estimate the RPM that the disk needs to be rotated at so that the oxygen level at the centerline of the disk (i. e., at x = δ) is at least 25 mmHg. Assume Henry’s constant for the oxygen in this nutrient solution is equal to 0.73 mmHg μM−1.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

thats a little if u want the answer just look it up on google thats what i do haha : )

there are two significant figures.