like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius ...

Figure 2: Positive-ion μESI-MS of protein and protein–DNA mixtures, over mass range 3,000–5,000 amu, in 10 mM NH 4 HCO 3 at pH 8.0. Figure 3: Positive-ion μESI-MS of protein–DNA mixtures ...