Which type of bond is formed between atoms of solid gold

The type of bond formed is known as a metallic bond

In order to identify the type of bond formed between atoms, you must know the requirements needed for each:

A covalent bond can only have non-metals. In this type of bonding, electrons are shared between atoms.

An ionic bond has both non-metals and metals. In this type of bonding, electrons are transferred. In other words, one atom gives electrons to another atom.

Finally, a metallic bond has only metals. In this type of bonding, electrons are delocalized. Essentially, it means that electrons just float around the metal atoms, and aren't designated to a specific atom. (This quality is the reason why metals are so conductive)

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.