All the s - block elements of the periodic table and placed in the groups

Options

A. 17 and 18
B. 15 and 16
C. 1 and 2
D. 18

Answer

To determine the groups in which all the s-block elements of the periodic table are placed, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Periodic Table**:
- The periodic table is divided into groups (columns) and periods (rows). There are 18 groups and 7 periods in the modern periodic table.

2. **Identify the s-block Elements**:
- The s-block elements are those elements where the last electron enters the s orbital. This includes elements from Group 1 (alkali metals) and Group 2 (alkaline earth metals).

3. **List the Groups of s-block Elements**:
- Group 1: Contains alkali metals such as Lithium (Li), Sodium (Na), Potassium (K), etc.
- Group 2: Contains alkaline earth metals such as Beryllium (Be), Magnesium (Mg), Calcium (Ca), etc.

4. **Conclusion**:
- Therefore, all the s-block elements are located in **Group 1 and Group 2** of the periodic table.

### Final Answer:
The s-block elements of the periodic table are placed in **Group 1 and Group 2**.

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