Mention the geometrical shapes of the following molecules :
`BF_3`

Explanation

To determine the geometrical shape of the molecule \( BF_3 \), we can follow these steps:

### Step 1: Identify the central atom
The central atom in \( BF_3 \) is boron (B).

### Step 2: Determine the number of valence electrons
Boron has 3 valence electrons, and each fluorine (F) atom has 7 valence electrons. Since there are three fluorine atoms, the total number of valence electrons contributed by fluorine is \( 3 \times 7 = 21 \). Therefore, the total number of valence electrons in \( BF_3 \) is:
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