(a) Which two would form the most polar single bond?(b) Which two would form the longest single bond?(c) Which two would be likely to form a compound of formula XY2?(d) Which combinations of elements...

(a) Which two would form the most polar single bond?(b) Which two would form the longest single bond?(c) Which two would be likely to form a compound of formula XY2?(d) Which combinations of elements would likely yield a compound of empirical formula X2Y3? In each case explain your answer.