In the table given below, fill the vacant places.

`{:("Elements","Hydrides","Oxides"),(N,NH_3,),(Al,,Al_2O_3),(C,,CO_2):}`

Explanation

To fill in the vacant places in the given table, we need to determine the hydrides and oxides of the specified elements: nitrogen, aluminum, and carbon.

### Step-by-Step Solution:

1. **Finding the Oxide of Nitrogen:**
- The atomic number of nitrogen (N) is 7, and its electronic configuration is 1s² 2s² 2p³, which means it has 5 valence electrons.
- Nitrogen can accept 3 electrons to complete its octet, so its valency is 3.
- The atomic number of oxygen (O) is 8, and its electronic configuration is 1s² 2s² 2p⁴, meaning it has 6 valence electrons.
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