The characteristic not related to alkali...

The characteristic not related to alkali metal is `

Their ions are isoelectronic with noble gases

Low melting point

Low electronegativity

High ionisation energy

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The correct Answer is:

Alkali metals have low ionization enthalpies. In fact, their ionization enthalpies are lowest in their respective period.

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The alkali metals

show increasing metallic alkali nature from Li to Cs

from salts which are predominantly covalent

shoe decreased chemical reactivity with dry oxygen in going from Li to Cs

shoe increasing electronegativity from Li to Cs.

`(n-1)s^(2)p^(6)ns^(2)`

`(n-1)s^(2)p^(6)d^(10)ns^(1)`

`(n-1)s^(2)p^(6)ns^(2)np^(1)`

`(n-1)s^(2)p^(6)ns^(1)`

Highest electronegativity

Largest atomic radii

Highest density

Highest ionisation