With reference of first three periods of the periodic table.
Noble gas with electronic configuration of 2,8 .

Explanation

To solve the question regarding the noble gas with the electronic configuration of 2,8, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Electronic Configuration**: The electronic configuration of an element describes how electrons are distributed in its atomic orbitals. The notation "2,8" indicates that there are 2 electrons in the first shell and 8 electrons in the second shell.

2. **Determine the Total Number of Electrons**: To find the atomic number of the element, we need to add the number of electrons in each shell.
- First shell: 2 electrons
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