Which statement is false for an element, having 2,8,8,2 electronic configuration:-

Options

A. This element is of `II^(nd)` group
B. This element is of `IV^(th)` period
C. It forms `MO_(2)` type oxide
D. It forms `M_(2)O` type oxide

Answer

To determine which statement is false for an element with the electronic configuration 2, 8, 8, 2, we will analyze the given electronic configuration step by step.

### Step 1: Identify the Element
The electronic configuration provided is 2, 8, 8, 2. This means:
- The first shell (n=1) has 2 electrons.
- The second shell (n=2) has 8 electrons.
- The third shell (n=3) has 8 electrons.
- The fourth shell (n=4) has 2 electrons.

The last shell has 2 electrons, indicating that the element belongs to Group 2 of the periodic table (alkaline earth metals).

**Hint:** Look at the number of valence electrons to determine the group of the element.

### Step 2: Determine the Period
The highest principal quantum number (n) in the electronic configuration is 4 (from the fourth shell). This indicates that the element is in Period 4 of the periodic table.

**Hint:** The period of an element corresponds to the highest energy level (n) that has electrons.

### Step 3: Identify the Element
Given that the element has 2 valence electrons and is in Group 2, the element is Calcium (Ca), which has the atomic number 20.

**Hint:** Use the group and period information to identify the element.

### Step 4: Analyze the Oxide Formation
Next, we need to analyze the type of oxide formed by Calcium:
- Calcium (Ca) has 2 valence electrons and tends to lose these electrons to achieve a noble gas configuration, forming Ca²⁺.
- Oxygen (O) has 6 valence electrons and tends to gain 2 electrons to achieve a noble gas configuration, forming O²⁻.

When Calcium and Oxygen react, they form Calcium Oxide (CaO), which is of the type MO (where M is a metal and O is oxygen).

**Hint:** Consider the charges of the ions formed to determine the type of oxide.

### Step 5: Evaluate the Statements
Now, we evaluate the statements given in the question:
- **Statement A:** This element is of Group 2. (True)
- **Statement B:** This element is of the fourth period. (True)
- **Statement C:** This element forms MO₂ type of oxide. (False, it forms MO type)
- **Statement D:** This element forms M₂O type of oxide. (False, it forms MO type)

### Conclusion
The false statements are C and D. Therefore, the answer to the question is that the false statements are related to the type of oxide formed by the element.

**Final Answer:** Statements C and D are false.