The characteristic not related to alkali metal is `

Options

A. their ions are isoelectronic with noble gases
B. low melting point
C. low electrongegativity
D. high ionisation energy

Answer

D

Explanation

The alkali metals have `ns^(1)` outer electronic configuration thus on losing this `e^(-)`, the ion formed will be isoelectronic with noble gases.
The energy binding the atoms in the crystal lattices of these metals is relatively low due to presence of only one electron in the valence shell. Thus alkali metals have low melting points.
Alkali metals are highly electropositive thus, they have low electronegativity.
The alkali metals have large size and the outermost electron is far from the nucleus and tus have relatively low ionisation energies.