Write True/False :
Group-18 contain maximum gaseous elements.

Answer

To determine whether the statement "Group-18 contains maximum gaseous elements" is true or false, we can analyze the properties of the elements in Group 18 of the periodic table.

### Step-by-Step Solution:

1. **Identify Group 18 Elements**:
Group 18 of the periodic table is known as the noble gases. The elements in this group are:
- Helium (He)
- Neon (Ne)
- Argon (Ar)
- Krypton (Kr)
- Xenon (Xe)
- Radon (Rn)

2. **State of Matter of Group 18 Elements**:
All the elements in Group 18 are gases at room temperature and standard atmospheric pressure. This is a characteristic property of noble gases due to their complete valence electron configuration, which makes them stable and unreactive.

3. **Comparison with Other Groups**:
To determine if Group 18 contains the maximum number of gaseous elements, we can compare it with other groups in the periodic table.
- For example, Group 1 (alkali metals) and Group 2 (alkaline earth metals) contain only solid elements at room temperature.
- Group 17 (halogens) contains gaseous elements (like Fluorine and Chlorine), but also contains solids (like Iodine) and liquids (like Bromine).

4. **Conclusion**:
Since all six elements in Group 18 are gases and no other group has more gaseous elements than this, we can conclude that the statement "Group-18 contains maximum gaseous elements" is true.

### Final Answer:
**True**

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