30 points. !
which is greater, the atomic radius of krypton (kr), or the ionic radius of strontium cation (sr^2+)? justify your answer in terms of nuclear charge, effective nuclear charge (z_eff), number of principle energy levels, and the shielding effect.

10.063g / 10.00 ml = 1.0063 g/ml which rounds off to 4 sig figs as: 1.006 g/ml

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.