Please help me with this homework

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Draw two cyclic constitutional isomers of cis-1

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line