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.


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