Identify the substances that are oxidized and the substances that are reduced in the following reactions :
`4Na_((s))+O_(2(g))to2Na_(2)O_((s))`

Explanation

To identify the substances that are oxidized and reduced in the reaction `4Na(s) + O2(g) → 2Na2O(s)`, we will follow these steps:

### Step 1: Write down the reaction
The given reaction is:
\[ 4Na(s) + O_2(g) \rightarrow 2Na_2O(s) \]

### Step 2: Identify the oxidation states
- Sodium (Na) in its elemental form has an oxidation state of 0.
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