How many shells are there in an atom of silicon?

Explanation

To determine how many shells are present in an atom of silicon, we can follow these steps:

### Step 1: Identify the position of silicon in the periodic table.
Silicon is located in group 14 and period 3 of the periodic table.

### Step 2: Understand the significance of the period number.
The period number of an element indicates the number of electron shells or energy levels that the atom has.

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