Assertion : The 5 th period of periodic table contains 18 elements not 32 . Reason : n =…
Chemistry · JEE Advanced · NTA Exams — Classification of Elements and Periodicity in Properties
Assertion : The 5th period of periodic table contains 18 elements not 32 .
Reason : n = 5, l = 0, 1, 2, 3, 4 . The order in which the energy of available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p and the total number of orbitals available are 9 and thus 18 electrons can be accomodated.
Reason : n = 5, l = 0, 1, 2, 3, 4 . The order in which the energy of available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p and the total number of orbitals available are 9 and thus 18 electrons can be accomodated.
- If both assertion and reason are correct and reason is the correct explanation of assertion.
- If both assertion and reason are true but reason is not the correct explanation of assertion.
- If assertion is true but reason is false.
- If assertion is false but reason is true.
Answer
(D) If assertion is false but reason is true.
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