Elements with similar valence shell configuration in a Periodic Table are placed in

Options

A. different group
B. same period
C. different period
D. same group

Explanation

To solve the question "Elements with similar valence shell configuration in a Periodic Table are placed in," we need to analyze the periodic table and the concept of groups and periods.

### Step-by-Step Solution:

1. **Understanding Valence Electrons**:
- Valence electrons are the electrons present in the outermost shell of an atom. They determine the chemical properties of the element.

2. **Periodic Table Structure**:
- The periodic table is organized into rows called periods and columns called groups.
- Elements in the same group have similar chemical properties because they have the same number of valence electrons.

3. **Identifying Groups**:
- For example, all alkali metals (like Lithium, Sodium, Potassium) are in Group 1 and have one valence electron (configuration ending in s1).
- Similarly, alkaline earth metals (like Beryllium, Magnesium, Calcium) are in Group 2 and have two valence electrons (configuration ending in s2).

4. **Identifying Periods**:
- Elements in the same period have the same number of electron shells but can have different valence electron configurations.
- For instance, in the second period, we have Lithium (2s1) and Neon (2s2p6), which are in the same period but have different valence configurations.

5. **Conclusion**:
- Since elements with similar valence shell configurations are placed in the same group, the answer to the question is "same group."

### Final Answer:
Elements with similar valence shell configuration in a Periodic Table are placed in **same group**.

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