Which pair of elements would be expected to form an ionic bond?

a. nitrogen and oxygen

b. lithium and fluorine

c. carbon and hydrogen

d. silicon and chlorine

The correct answer is option B. Lithium and fluorine.

Explanation:

Ionic bonds are formed between oppositely attracted ions. It is an electrostatic attraction between metal and nonmetals.

Lithium is metal and fluorine is nonmetal whereas nitrogen and nitrogen and oxygen are nitrogen does not form an ionic bond. Carbon and hydrogen are organic.

Chlorine could make an ionic bond but not with silicon.

Thus, the correct answer is - b. Lithium and fluorine.

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the backbone of the dna and rna compound is sugar phosphate.