We are asked to determine among K, C, Zn, F, which is most likely to form an ionic compound with Ba.
Recall that an ionic compound is formed when a cation (a positively charged ion) combines with an anion (a negatively charged ion).
Ba is from Group 2A hence, it would have +2 charge, Ba2+.
By referring only to the periodic table, select the element in the group K, C, Zn, F, that is most likely to form an ionic compound with Ba.
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