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

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

age range would be the answer