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According to ( n + l) rule after complet...

According to `( n + l)` rule after completing 'np' level the electron enters into

A

`(n-1)d`

B

`(n+1)s`

C

`nd`

D

`(n+1)p`

Text Solution

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The correct Answer is:
To solve the question "According to (n + l) rule after completing 'np' level the electron enters into", we can follow these steps: ### Step-by-Step Solution: 1. **Understand the (n + l) Rule**: The (n + l) rule helps determine the order in which electrons fill atomic orbitals. Here, 'n' is the principal quantum number and 'l' is the azimuthal quantum number. The lower the value of (n + l), the earlier the orbital is filled. 2. **Identify the Current Orbital**: The question specifies that we are considering the 'np' level. The 'n' in 'np' represents the principal quantum number of the p orbital. 3. **Determine the Next Orbital**: According to the (n + l) rule, after filling the 'np' orbital, the next electrons will fill the orbital with the next lowest (n + l) value. - For the 'np' orbital, 'n' is the principal quantum number and 'l' for p is 1. - Therefore, the (n + l) value for 'np' is (n + 1). 4. **Identify the Next Orbital Based on n**: After completing the 'np' level, the next orbital to be filled will be the (n + 1)s orbital. - For example, if n = 3 (3p), after completing the 3p level, the next orbital will be 4s (where n = 4). 5. **Conclusion**: Thus, after completing the 'np' level, the electron enters into the (n + 1)s orbital. ### Final Answer: After completing the 'np' level, the electron enters into the **(n + 1)s** orbital. ---
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