) Core electrons shield valence electrons so that they experience an effective nuclear charge (Zeff) rather than the full nuclear charge. Given that the first ionization potential of Li is 5.39 eV, estimate the effective nuclear charge experienced by the 2s electron in Li.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth