Potassium is a metal and chlorine is a nonmetal. if these two elements were to bond, they would form a(n) ionic compound covalent compound element molecule

Ionic bond because it forms when electrons are exchanged between a non-mental and a metal.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.