Which of the following elements can combine with others to form compounds?

Hydrogen is a unique and versatile element that can combine with many others to form a wide variety of compounds. It is the simplest and most abundant element in the universe, and its ability to easily bond with other elements is a fundamental characteristic that gives rise to numerous chemical reactions and compounds.

For instance, hydrogen can bond with oxygen to create water, which is essential for life. Additionally, it combines with carbon to form hydrocarbons, which are the basis of many organic compounds. This makes hydrogen a key element in chemistry and biochemistry, playing a crucial role in the formation of a vast array of substances.

In contrast, while sodium and carbon are also elements that can form compounds, hydrogen's ability to form diverse compounds across a wide range of different contexts distinguishes it in this scenario. Gold, being a noble metal, is less reactive and typically does not combine readily with other elements to form compounds under normal conditions, which further highlights why hydrogen is particularly notable for its compound-forming capabilities.