Question

How does a negative ion differ from an uncharged atom of the same element?

Answer 1

the ion has a greater number of electrons

Step-by-step explanation:

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Answer 2

When an atom or molecule accepts or looses an electron or electrons it gets either negative charge (when electrons gained) or a positive charge (when looses electron). The negative ion is called Anion and positve ion is called the Cation. An Ion can be Atomic or Polyatomic.

Example:
Sodium when looses one electron forms a cation i.e. Na⁺

Chlorine when gains one electron forms an Anion i.e. Cl⁻

Result:
A negative ion (Anion) differ from an uncharged atom of the same element in the number of electrons. An anion contains more electrons than its corresponding Neutral Element.