NEET Chemistry Periodic Table Assertion Reason Question
Assertion (A): The presence of 18 elements in the 5th period of the Periodic Table is due to the filling of available orbitals.
Reason (R): The energy order of orbitals in the 5th period is 5s < 4d < 5p.
Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false.
Correct Answer
Detailed Explanation
The assertion is supported by the fact that 18 elements are present in the 5th period due to the filling of 5s, 4d, and 5p orbitals, which can accommodate a total of 18 electrons. The reason correctly explains the energy order of these orbitals.
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