Question

Which of the following elements is most likely to form an ion that will then form an ionic bond with an ion of a Group 1A element?
a. Be
b. Br
c. Pt
d. Fr

Answer 1

Group 1A (the alkali metals) almost always form cations (positive ions). They'd need anions (negative ions) to ionic bond with. Beryllium (Be) is group 1A already and forms Be+ cation. Bromine is a halogen, and forms Br-, an anion. Platinum is a metal, and usually won't ionic bond with anything. Francium is rare and highly radioactive, plus it so happens to be group 1A as well. Only bromine can form the anion that the group 1A cations need.