The Question is from neet-chemistry , and it was created by the author P SRAVAN KUMAR

Question

Mendeleev placed some elements with higher atomic weights before elements with lower atomic weights.  This was done to:

P SRAVAN KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Mendeleev's Periodic Table and its construction
 **Related Topics**: Periodic trends, atomic weight, chemical properties, periodicity
 **Prerequisites**: Basic understanding of the periodic table and the concept of atomic weight.
## SOLUTION PATHWAY
**Given Information**:
  Mendeleev arranged elements with higher atomic weights before those with lower atomic weights in some cases.
  [Important conditions]: This was a deliberate decision in the construction of his periodic table.
**Method & Steps**:
 1. Understand the goal of Mendeleev's periodic table:  To organize elements based on their recurring (periodic) chemical properties.
  Reasoning: Mendeleev's primary goal wasn't simply to list elements by atomic weight.  The order was designed to reflect chemical similarities.
  Formula/Rule: No specific formula, but the underlying principle is the observation of periodic trends in properties.
 2. Recognize the exceptions: In some instances, placing elements strictly by atomic weight would disrupt the observed periodicity of properties.
  Working:  If an element's properties better fit within a group with elements of slightly lower atomic weight, Mendeleev prioritized maintaining the periodicity of properties.
  Key Point:  The periodic arrangement was more important than strict atomic weight order.
 3. Conclude the reason for the exception: Mendeleev made these exceptions to ensure that elements with similar chemical properties were grouped together, even if it meant deviating from a purely atomic weight-based arrangement.
  Result: The arrangement was done to maintain the periodicity of chemical properties.
  Verification:  The success of Mendeleev's table, with its predictive power for undiscovered elements, validates this approach.
 ## OPTION ANALYSIS
A :x: Following alphabetical order is irrelevant to the organization principles of the periodic table.
B :x: While Mendeleev did leave gaps for undiscovered elements, this was a consequence of his periodic arrangement, not the primary reason for placing higher atomic weight elements before lower ones.
C ✓: This is the correct answer. Mendeleev's primary goal was to organize elements based on their recurring chemical properties, even if it meant deviating from strict atomic weight ordering.
D :x: The abundance of elements was not a primary factor in Mendeleev's arrangement. 
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Thinking that Mendeleev's table was solely based on atomic weight:  Atomic weight was a key factor, but it was subordinated to the more important principle of periodic chemical properties.
  2.Overlooking the predictive power of the table: Mendeleev's arrangement allowed him to predict the properties of undiscovered elements, further supporting the importance of chemical periodicity.
 **Quick Tips**:
  1.Remember that the periodic table is organized primarily by chemical properties, not just atomic weight.
  2.Focus on the recurring patterns (periodicity) of elements' properties.

P SRAVAN KUMAR · Answer

Follow alphabetical order

P SRAVAN KUMAR · Answer

Account for undiscovered elements

P SRAVAN KUMAR · Answer

The correct Option is "Maintain the periodicity of chemical properties"

P SRAVAN KUMAR · Answer

Reflect the abundance of elements

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