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Solution


Q.

Correct statements for an element with atomic number 9 are

A. There can be 5 electrons for which ms=+12 and 4 electrons for which ms=-12

B. There is only one electron in pz orbital

C. The last electron goes to orbital with n=2 and l=1

D. The sum of angular nodes of all the atomic orbitals is 1.

Choose the correct answer from the options given below:                            [2025]
1 C and D Only  
2 A and C Only  
3 A, C and D Only  
4 A and B Only  

Ans.

(2)

(A)    

(B)   The unpaired electron of 2p subshell can be in px,py or pz.

(C)   The last electron is in 2p orbital i.e. n=2, l=1.

(D)   Angular nodes of an orbital = 1

For each s orbital, angular node = 0. For each of three p orbitals, angular nodes = 1. So total angular nodes = 3.