## Ruchi. 3 years ago A compound of vanadium has a magnetic moment of 1.73 BM.WORK out the electronic configuration of the vanadium ion in the compound.

1. shivam_bhalla

$Magnetic \space moment = \sqrt{n(n+2)}$ where n-->number of unpaired electron :)

2. Ruchi.

n=3

3. Ruchi.

its given that u=1.73

4. Ruchi.

i m confuse

5. shivam_bhalla

@Ruchi. $1.73 = \sqrt{n(n+2)}$ Therefore n = 1 Therefore number of unpaired electron = 1 Now try to finish it off :)

6. Ruchi.

7. Ruchi.

hw u gt n=1

8. shivam_bhalla

@Ruchi. , substitute n=1 and see in the formula :P

9. Ruchi.

wait

10. Ruchi.

1.73 = sqrt(3) = sqrt(n(n+2)) So, n(n+2) = 3 or n = 1 For V, Z = 23, [Ar]4s23d3 am i right.

11. shivam_bhalla

Yes. @Ruchi, now tell me if Vanadium has 3 unpaired electrons, and you know that the vanadium ion is having 1 unpaired electron, then now can you figure out the charge on vanadium ion :)

12. Ruchi.

@shivam_bhalla i m nt getting its electrnic configration

13. Ruchi.

1s2 2s2 2p6 3s2 3p6 4s2 3d3.

14. shivam_bhalla

@Ruchi. , This question is more intersesting now :P. Let me have a check and let you know the electron configuration.

15. shivam_bhalla

@Ruchi. Your task is to get a vanadium ion with 1 unpaired electron . Now a simple question to you , first where will you remove the electron from vanadium first ?? s orbital or p orbital ?

16. Ruchi.

p

17. shivam_bhalla

Typo ; I meant 3s orbital or 3d orbital ??

18. Ruchi.

V+4=1S2 2s2 2p6 3s2 3p6 3d1.

19. Ruchi.

am i right.

20. Ruchi.

what r u telling i m nt understanding.

21. shivam_bhalla

Ruchi, The configuration you gave for V4+ is wrong. Think why ?? (tip:check the number of electrons is 4s orbital )

22. shivam_bhalla

You should always mention 4s 0 while writing the V4+ configuration. So you are partially right @Ruchi.

23. shivam_bhalla

@Ruchi. V+4=1S2 2s2 2p6 3s2 3p6 4s0 3d1

24. Ruchi.

0 ka mention torina nakariga.

25. Ruchi.

kariga

26. shivam_bhalla

Revise aufbau principle @ruchi. Remove 2 electrons from 4s orbital, then 2 electrons from 3d orbital to get V4+