1.- the electron configuration of a neutral atom is1s 2 2s 2 2p 6 3s 2 . Write a

Question

1.- the electron configuration of a neutral atom is1s22s22p63s2. Write acomplete set of quantum numbers for each of the electrons. Name theelement. 2.- Indicate the total number of a) p electrons in N(Z =7); b) s electrons in Si (Z = 14); and c) 3d electrons in S (Z =16). 3.-Write the ground state electron configurations for thefollowing elements: Ge, Fe, Zn, Ni, B, V, C, As, W, Tl, I,Au. 1.- the electron configuration of a neutral atom is1s22s22p63s2. Write acomplete set of quantum numbers for each of the electrons. Name theelement. 2.- Indicate the total number of a) p electrons in N(Z =7); b) s electrons in Si (Z = 14); and c) 3d electrons in S (Z =16). 3.-Write the ground state electron configurations for thefollowing elements: Ge, Fe, Zn, Ni, B, V, C, As, W, Tl, I,Au.

Explanation / Answer

1.- the electron configuration of a neutral atom is1s22s22p63s2. Write acomplete set of quantum numbers for each of the electrons. Name theelement n ====> l = ( n - 1 ) l= 0 for s orbital ; l= 1 forp orbital    ; l= 2 for dorbital ; l= 3 for f orbital The values of m are ranging from -l to +l including 0
1s2    : n = 1 ; l = 0 ; m= 0 ; s =- ( 1/ 2 )   2s2     : n = 2 ; l = 0 ; m = 0   ; s = - ( 1/ 2 ) 2p6     : n = 2 ; l= 1 ; m = -3 ; s = - ( 1/ 2 ) 3s2       : n =3 ; l = 0 ; m = 0 ; s = - ( 1/ 2 ) Since , it has a total of ( 2+2+6+2 ) = 12 electrons. The element with at. no. 12 is Mg 2.- Indicate the total number of a) p electrons in N(Z =7); b) s electrons in Si (Z = 14); and c) 3d electrons in S (Z =16). a) p electrons in N(Z = 7) Electronic configuration :1s22s22p3 No. of p- electrons is 3 No. of p- electrons is 3 b) s electrons in Si (Z = 14) Electronic configuration :1s22s22p63s23p2 No. of s- electrons is 2+2+2 = 6 No. of s- electrons is 2+2+2 = 6 c) 3d electrons in S (Z = 16). Electronic configuration :1s22s22p63s23p4
Thereis no 3d orbital in the Electronic configuration of S , Sothe no . of 3d electrons is 0 3.-Write the ground state electron configurations for thefollowing elements: Ge( 32) : Electronic configuration :1s22s22p63s23p64s23d104p2 Fe(26) : Electronic configuration :1s22s22p63s23p64s23d6 Zn( 30 ) :Electronic configuration :1s22s22p63s23p64s23d10 Ni( 28 ) : Electronic configuration :1s22s22p63s23p64s23d8 B( 5 ) : Electronic configuration :1s22s22p1 V( 23 ) : Electronic configuration :1s22s22p63s23p64s23d3 C ( 6 ) : Electronic configuration :1s22s22p2 As ( 33 ) : Electronic configuration :1s22s22p63s23p64s23d104p3 W( 74 ) : Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p6 6s24f14 5d 4 Tl ( 81 ) :Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p6 6s24f14 5d 10 6p 1 I( 53 ) : Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p5 Au( 79 ) : Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p6 6s14f14 5d 10 Tl ( 81 ) :Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p6 6s24f14 5d 10 6p 1 I( 53 ) : Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p5 Au( 79 ) : Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p6 6s14f14 5d 10 Au( 79 ) : Electronic configuration :1s22s22p63s23p64s23d104p65s2 4d10 5p6 6s14f14 5d 10

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