1.- Indicate which of the following sets of quantum numbers inan atom are unacce

Question

1.- Indicate which of the following sets of quantum numbers inan atom are unacceptable and explain why: a) (1,1,+1/2,-1/2),  b) (3,0,-1,+1/2),   c)(2,0,+1,+1/2),   d) (4,3,-2,+1/2),   e)(3,2,+1,1) 2.- the ground-state electron configurations listed here areincorrect. Explain what mistakes have been made in each and writethe correct electron configurations. Al:1s22s22p43s23p3 B: 1s22s22p5 F: 1s22s22p6 1.- Indicate which of the following sets of quantum numbers inan atom are unacceptable and explain why: a) (1,1,+1/2,-1/2),  b) (3,0,-1,+1/2),   c)(2,0,+1,+1/2),   d) (4,3,-2,+1/2),   e)(3,2,+1,1) 2.- the ground-state electron configurations listed here areincorrect. Explain what mistakes have been made in each and writethe correct electron configurations. Al:1s22s22p43s23p3 B: 1s22s22p5 F: 1s22s22p6 F: 1s22s22p6

Explanation / Answer

( 1 ) n ===> l = ( n- 1 )                     m= -l to + l including 0                    s = either - ( 1/2 ) or + ( 1/2 )   In the given quantum numbers a) (1,1,+1/2,-1/2),       n=1, l=1, m l = +1/2 , s=+1/2 l value reaches to n ( equal to n ) & m l valueis fractional (  m l value is not  fractional ) So ,it is not acceptable. e) (3,2,+1,1) In this case s = 1 which is abuse. So ,it is also not acceptable. So. ( a ) & ( e ) are not acceptable ( 1 ) n ===> l = ( n- 1 )                     m= -l to + l including 0                    s = either - ( 1/2 ) or + ( 1/2 )   In the given quantum numbers a) (1,1,+1/2,-1/2),       n=1, l=1, m l = +1/2 , s=+1/2 l value reaches to n ( equal to n ) & m l valueis fractional (  m l value is not  fractional ) So ,it is not acceptable. e) (3,2,+1,1) In this case s = 1 which is abuse. So ,it is also not acceptable. So. ( a ) & ( e ) are not acceptable ( 2 ) The maximum no. of electrons in s orbital is 2
The maximum no. of electrons in p orbital is 6 ( 2 ) The maximum no. of electrons in s orbital is 2
The maximum no. of electrons in p orbital is 6 Al( At. no. 13 ) :1s22s22p43s23p3 Actual configurationis  1s22s22p63s23p1 After filling of all the p electrons in 2p orbital only thenext electron goes to 3s orbital After filling of all the p electrons in 2p orbital only thenext electron goes to 3s orbital B: 1s22s22p5 Actual configurationis  1s22s22p1    ( Since the atomic no. of B is 5 ) F ( at . no. 9 ) : 1s22s22p6 Actual configurationis  1s22s22p5    ( Since the atomic no. of F is 9) Actual configurationis  1s22s22p5    ( Since the atomic no. of F is 9) Actual configurationis  1s22s22p5    ( Since the atomic no. of F is 9)

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