Question

Name the element which forms the stable fluoro complex anions?

Answer 1

The element forming the stable fluoro complex anions:

• A Fluoro complex anion is known as an anion that contains an element and Fluorine atoms, in which the elements of higher oxidation states are mostly found.
• They are also known as complex fluorides.
• Fluoro complex anions can occur in salts, or in solution, but they never occur as pure acids.
• $\mathrm{Be}$ generally found to form fluoro complex anions which are mostly stable.
• This happens due to the small size and higher charge density of Beryllium.
• Example: Tetrafluoroberyllate or Ortho-fluoro beryllate( ${\mathrm{BeF}}_4^{-2}$), for which the structure can be shown as:

Hence, the element which forms the stable fluoro complex anions is Beryllium ($\mathrm{Be}$).