OnlineCBT
Chemistry · Structure of atom
हिन्दीGiven below are two statements:\n Statement I: The 4s orbital has a lower \( (n + l) \) value than the 3d orbital, hence 4s fills before 3d.\n Statement II: Valence electrons are those electrons added to the electronic shell with the lowest principal quantum number. \nIn the light of the above statements, choose the most appropriate answer from the options given below:
Correct answer · Option 3
Statement I is correct but Statement II is incorrect.
Explanation
Statement I is correct (\( 4s \) has \( n+l = 4 \), \( 3d \) has \( n+l = 5 \)). Statement II is incorrect because valence electrons are added to the shell with the highest principal quantum number.
