The discussion centers around the properties of hydrides and their internuclear distances in various compounds. It highlights that hydrides cannot exist in isolation and emphasizes the significance of counter ions in determining their characteristics. Specific internuclear distances are provided for hydrogen ions in water, hydrogen sulfide, H2Se, and H2Te, illustrating how these distances vary across different compounds. The conversation also clarifies that the radius of hydride (H-) is nearly identical to that of hydrogen, with minimal changes due to electron interactions. Additionally, it notes that ionic radii are a rough measure and presents an average radius for H- based on alkali metal hydride crystal structures. The discussion also touches on the demographics of forum users, questioning which nationalities are most active and in what contexts.
