7. The following ionization energies were found for an unknown element: - 1st Ionization Energy 5.98576 eV - 2nd Ionization Energy 18.82855 eV - 3rd Ionization Energy 28.44765 eV - 4th Ionization Energy 119.992 eV - 5th Ionization Energy 153.825 eV What is a common ion for the unknown element above

What must happen before a body cell can begin mitotic cell division

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

Compare and contrast the bohr model and the electron cloud models of the atom.