Modern Physics Ques 285
- If elements with principal quantum number $n>4$ were not allowed in nature, the number of possible elements would be
$(1983,1 M)$
(a) $60$
(b) $32$
$4$
(d) $64$
Show Answer
Answer:
Correct Answer: 285.(a)
Solution:
- The maximum number of electrons in an orbit are $2 n^{2}$. If $n>4$, it is not allowed, then the number of maximum electrons that can be in first four orbit are :
$ 2(1)^{2}+2(2)^{2}+2(3)^{2}+2(4)^{2}=2+8+18+32=60 $
Therefore, possible elements can be $60$ .
BETA
