identify the ionic molecules that best meet the following description: a. group 2 the cation that has the third smallest radius, combined with group 17 that is isoelectronic with the noble gas in row 4. b. a +1 cation that is isoelectronic with the noble gas in row 2 , combined with the anion formed from the row 5 substance with the highest electronegativity. c. the cation of group 11 the substance with the smallest radius, combined in a 1:1 ratio with the smallest anion from group 16