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 2n2.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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