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Which group of elements could be placed ...

Which group of elements could be placed in mendeleev's periodic table without disturbing the original order ? Give reason.

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### Step-by-Step Solution: 1. **Identify the Group of Elements**: The group of elements that can be placed in Mendeleev's periodic table without disturbing the original order is the **noble gases**. 2. **Understand the Characteristics of Noble Gases**: Noble gases are known for being **inert** and **non-reactive**. They do not readily combine with other elements due to their complete valence electron shell. 3. **Historical Context**: When Mendeleev created his periodic table, noble gases were not yet discovered. Therefore, they were not included in his original classification. ...
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