## Chemistry and Chemical Reactivity (9th Edition)

a) $Ca^{2+}\lt K^+\lt Cl^-$ Ionic radius increase with a more negative charge due to electronic repulsion. b) $Cl^-\lt K^+\lt Ca^{2+}$ Removing an electron from a more positively charged ion is harder than from a more negatively charged one. c) $Ca^{2+}\lt K^+\lt Cl^-$ Adding an electron to a more negatively charged ion is harder than to a more positively charged one.