* Nonmetals: The majority of elements in molecular compounds are nonmetals. These are found on the right side of the periodic table, with the exception of hydrogen (H) which is a nonmetal located in the top left corner.
* Metalloids: Some metalloids, like silicon (Si) and boron (B), can form molecular compounds. Metalloids are found along the staircase separating metals and nonmetals.
* Hydrogen: As mentioned, hydrogen is a nonmetal and frequently forms molecular compounds.
Important Note: While most elements in molecular compounds are nonmetals, there are exceptions. For example, the following contain metals:
* Metal hydrides: Like sodium hydride (NaH)
* Metal oxides: Like carbon monoxide (CO) and carbon dioxide (CO2)
* Some metal halides: Like aluminum chloride (AlCl3)
Key Takeaway: Molecular compounds are primarily formed from nonmetals, but elements from other parts of the periodic table can also be involved.
