Find the period and group of the element whose atomic number is 12

Explanation

To find the period and group of the element with atomic number 12, we can follow these steps:

### Step 1: Identify the Element
The element with atomic number 12 is Magnesium (Mg).

### Step 2: Write the Electronic Configuration
Using the Aufbau principle (also known as the off-paul rule), we can determine the electronic configuration of Magnesium. The atomic number 12 means it has 12 electrons. The electronic configuration is as follows:
- 1s² 2s² 2p⁶ 3s²
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