The Z_eff values for the outermost electrons in Mg and Ca atoms derived from a set of quantum mechanical calculations are 3.31+ and 4.40+, respectively. Based on the trend for the values calculated for Mg and Ca, estimate the Z_eff value for the Sr atom.

Determine the effective charges in units of e on the H atom of the HCl molecule

Consider the following elements: In, Sn, Zr, Te, Sr.

List the elements from the most to least Z_eff experienced by the electrons in the n = 3 shell.

Determine the Z_eff of the 3s and 3p valence electrons in S assuming only core electrons contribute to the screening constant.

List the following elements from most to least amount of Z_eff affecting their valence electrons: Se, Br, K, Ga.

Calculate the effective nuclear charge of the valence electrons of Cl based on the following theoretical conditions:

• core electrons completely shield electrons from nuclear charge
• valence electrons do not shield one another