Question

Which occurs in the half-reaction Na(s) → Na+ + e−? *

A. Na(s) is reduced
B. Na(s) is oxidized
C. Na(s) gains electrons
D. Na+ is oxidized

Answer 1

Considering the definition of oxidation and reduction, Na(s) is oxidized.

Oxidation

Oxidation is a reaction where an atom, ion or molecule loses electrons, increasing the oxidation state.

In other words, oxidation is the loss of electrons by a molecule, atom, or ion. An element is oxidized when it loses electrons in a reaction; increasing in the oxidation state of the atom. The higher the oxidation state of an atom, the greater the degree of oxidation.

Reduction

The reduction corresponds to the gain of electrons of an atom, ion or molecule, lowering the oxidation state.

In other words, an element is reduced when it gains electrons in a reaction, lowering its oxidation state. The lower the oxidation state of an atom, the greater the degree of reduction.

This case

You know the half-reaction Na(s) → Na⁺ + e⁻

In this case, oxidation reaction takes place in which the oxidation of sodium changes from 0 to 1+, and the sodium loses 1 electron.

In summary, Na(s) is oxidized.

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