The electronic configuration of an element 'X' is 2, 8, 8, 2. To which (a) period and (b)group of the modern periodic table does 'X' belong? State its valency. Justify your answer in each case.

Explanation

To determine the period, group, and valency of the element 'X' with the electronic configuration of 2, 8, 8, 2, we can follow these steps:

### Step 1: Count the Total Number of Electrons
The electronic configuration given is 2, 8, 8, 2. We need to sum these numbers to find the total number of electrons.
- Total electrons = 2 + 8 + 8 + 2 = 20 electrons.

### Step 2: Identify the Period
The period of an element in the periodic table is determined by the highest principal quantum number (n) in its electronic configuration.
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