Which of the following pairs of atoms do not exhibit an ionic bond? n and h li and br o and mg f and cu which of the following pairs of atoms exhibit a covalent bond? cs and f na and o s and o k and cl

Which of the following pairs of atoms do NOT exhibit an ionic bond?  N and H

Which of the following pairs of atoms exhibit a covalent bond? S and O

Explanation:

An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion. In this way, the octet rule is fulfilled: this rule states that each atom in a molecule requires 8 valence electrons (in the last layer) to remain stable.

n this case you can see that N is a non-metallic element and H behaves like a nonmetal.. Then they exhibit covalent bond. Then the pair of atoms N and H do NOT exhibit an ionic bond

The covalent bond is the chemical bond between atoms where electrons are shared,  forming a unit called molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas.  In other words, sharing electrons, non-metallic elements must lose or gain in order to comply with the Octect rule.

In this case you can see that S and O are two non-metallic elements. Then they exhibit covalent bond.