Chemistry · Periodicity of Elements and Periodic Properties
JEE Main 2025 — 24 January, Morning Shift — Question 34
Which of the following statements are NOT true about the periodic table?
A. The properties of elements are function of atomic weights.
B. The properties of elements are function of atomic numbers.
C. Elements having similar outer electronic configuration are arranged in same period.
D. An element's location reflects the quantum numbers of the last filled orbital.
E. The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled.
In the light of the above statements, choose the correct answer from the options given below :
- Option A:Correct
A, C and E only
- Option B:
D and E only
- Option C:
A and E only
- Option D:
B, C and E only
Answer: A
Step-by-step solution
A is incorrect because modern periodic law states that properties are periodic function of atomic number, not atomic weight.
B is correct according to modern periodic law.
C is incorrect because elements with similar outer electronic configuration are arranged in the same group, not the same period.
D is correct because position in periodic table is based on electronic configuration, which depends on quantum numbers of the last filled orbital.
E is incorrect because the number of elements in a period is equal to the number of electrons that can be filled in the available orbitals, not the number of orbitals themselves.
Therefore, the incorrect statements are A, C and E.
Answer key and solution verified before publishing.
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- Exam
- JEE Main 2025
- Subject
- Chemistry
- Chapter
- Periodicity of Elements and Periodic Properties
- Topic
- Classification of Elements and Nomenclature of Superheavy Elements