Question

$Be$ and $Mg$ do not impact colour to flame due to :

• A. very high ionisation energy
• B. high ionic potential
• C. their greater covalent character
• D. All of the above

Answer 1

The correct option is A very high ionisation energy

$Be$ and $Mg$ have a very high ionisation energy due to their abnormally small size when compared to the other alkali earth metals. Due to this, the electrons in the atom are tightly held and thus, they have high ionisation energies.
Hence, $Be$ and $Mg$ do not undergo transition and do not impart characteristic wavelength to the flame.