Considering EA, is it possible for alkali metals to form an anion similar to M-, where on earth M represents an alkali metals

EA=Electron affinity.
Answers:
Yes, because any atom with a positive EA (alkali metals included) would be happy to adopt an extra electron to form an anion like M-.

You can make M- by bombarding the independent gas with electrons. Another way is to dissolve the metal contained by liquid ammonia and add a cryptate; you finishing up with M+ M- ions in ammonia solution. Source(s): Douglas, McDaniel, Alexander. Concepts and Models of Inorganic Chemistry, pg 712

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