The elements of group `1,2,13,14,15,16,17,18` are collectively called

Options

A. Noble elements
B. Typical elements
C. Transition elements
D. Representative elements

Explanation

To solve the question regarding the collective name for the elements of groups 1, 2, 13, 14, 15, 16, 17, and 18, we can follow these steps:

### Step 1: Identify the Groups
The groups mentioned in the question are:
- Group 1: Alkali metals
- Group 2: Alkaline earth metals
- Group 13: Boron group
- Group 14: Carbon group
- Group 15: Nitrogen group
- Group 16: Chalcogens
- Group 17: Halogens
- Group 18: Noble gases

### Step 2: Classify the Groups
Next, we need to classify these groups based on their block in the periodic table:
- Groups 1 and 2 are known as **s-block elements**.
- Groups 13 to 18 are known as **p-block elements**.

### Step 3: Understand the Terminology
Now, let's analyze the terms given in the options:
- **Noble elements**: This term is not applicable here as it specifically refers to noble gases (Group 18).
- **Typical elements**: This term is not commonly used to describe these groups collectively.
- **Transition elements**: These refer to d-block elements, which are not part of the groups mentioned.
- **Representative elements**: This term is used to collectively refer to the s-block and p-block elements.

### Step 4: Conclusion
Based on the classifications and terminology, the elements of groups 1, 2, 13, 14, 15, 16, 17, and 18 are collectively called **representative elements**.

### Final Answer
The correct option is **representative elements**.

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