Which pair of elements would be expected to form an ionic bond? a. nitrogen & oxygen b. lithium & fluorine c. carbon & hydrogen d. silicon & chlorine

lithium and fluorine  

Lithium donates an electron to fluorine and make the fluorine with a negative charge and a full outer shell. Lithium consequently get a positive charge and a full outer shell. They then are attracted to each other an form a giant ionic lattice.  

Carbon and hydrogen are organic so they don't  

Nitrogen and Oxygen are also organic.  

Chlorine can form ions but not with silicon

B. lithium & fluorine

substitution is the answer in this case

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.