Atoms And Nuclei Question 271
Question: If elements with principal quantum number n>4 were not allowed in nature, the number of possible elements would be
Options:
A) 60
B) 32
C) 4
D) 64
Show Answer
Answer:
Correct Answer: A
Solution:
- The maximum number of electron is in an orbit is $ 2n^{2}.n>4 $ is not allowed. Therefore the number of maximum electron that can be in first four orbits are $ 2{{( 1 )}^{2}}+2{{( 2 )}^{2}}+2{{( 3 )}^{2}}+2{{( 4 )}^{2}} $ $ =2+8+18+32=60 $ Therefore, possible element are 60.
