Question

Statement I: The $5s$ orbital is filled after the $4d$ orbital
BECAUSE
Statement II: The $5s$ orbital has a lower energy than the $4d$ orbital

• A. Statement $1$ and Statement $2$ are correct and Statement 2 is the correct explanation of Statement $1$
• B. Both the Statement $1$ and Statement $2$ are correct and Statement $2$ is NOT the correct explanation of Statement $1$
• C. Statement $1$ is correct but Statement $2$ is not correct
• D. Statement $1$ is not correct but Statement $2$ is correct
• E. Both the Statement $1$ and Statement $2$ are not correct

Answer 1

Answer: (D)

Statement $1$ is not correct but Statement $2$ is correct

The $5s$ orbital has a lower energy than the $4d$ orbital. Lower energy orbitals are filled first. Hence $5s$ will be filled before $4d$.

Option D is the correct answer.