Answer:
a) Covalent
b) Metallic
c) Ionic
Step-by-step explanation:
Here, we want to match the elements to the correct bond types
a) Nitrogen and oxygen
These are elements with similar electronegativities. Due to this, they tend to bond by covalent bonding wherein electrons are shared
b) Gold and gold
This is also a type of covalent bonding called metallic bonding. It is called metallic as it is between two metallic atoms
c) Lithium and Chlorine
What we have here would be an ionic bonding. This is because we are having a metallic atom bonded to a non-metallic atom. It is happening because of the large electronegativity gap between the two elements. In the real sense, lithium would donate the single electron in its valence shell to the valence shell of chlorine that needs an extra one