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The element that has the abbreviated ground state electron configuration

The element that has the abbreviated ground state electron configuration

The element that has the abbreviated ground state electron configuration [Ar]4s23d6 is:

A)  Fe    B)  Co    C)  Se    D)  Mn

 

62.              The element that has the abbreviated ground state electron configuration [Ar]4s23d5 is:

A)  Mn    B)  Cr    C)  V    D)  Fe    E)  no element—this configuration is incorrect.

 

63.              What is the abbreviated ground state electron configuration for Sc?

A)  [Ar]4s3    B)  [Ar]4s24p1    C)  [Ar]4s24d1    D)  [Ar]4s23d1    E)  [Ar]3d3

 

64.              What is the abbreviated ground state electron configuration for Co?

A)  [Ar]4s9    B)  [Ar]3d9    C)  [Ar]4s24p7    D)  [Ar]4s24p64d1    E)  [Ar]4s23d7

 

65.              The element that has two completely filled p sublevels, and four electrons in its other psublevel is:

A)  S    B)  O    C)  Se    D)  Si    E)  Ge

 

66.              The element that has three completely filled s sublevels, one electron in its other s sublevel,and no d electrons is:

A)  Na    B)  K    C)  Ca    D)  Mg    E)  C

 

67.              The element that has four completely filled s sublevels, and three d electrons is:

A)  V    B)  Cr    C)  Nb    D)  Ti    E)  Sc

 

68.              Which of the following statements regarding valence electrons is incorrect?

A)The valence electrons are the electrons in the last-filled principal energy level.

B)For main-group elements, the number of valence electrons is equal to the number of electrons in the highest-energy s and sublevels.

C)Except for helium, the Roman numeral group number corresponds to the number of valence electrons for the main-group elements.

D)The period number of an element equals the energy level of the valence electrons.

E)Elements in the p-block in the fourth period and below include their d electrons as part of their valence electron count.

 

69.              Which of the following statements regarding valence electrons is incorrect?

A)Main-group elements in the same group have the same number of valence electrons.

B)The group numbers of the main-group elements are the sum of the number of s and p valence electrons.

C)The elements in the s-block can have up to two valence electrons.

D)An element in Group IVA will have six valence electrons.

E)The electron configuration for nitrogen is 1s22s22p3, so it has five valence electrons.

 

70.              The valence level and the number of valence electrons, respectively, for calcium

A)  4 and 2    B)  2 and 4    C)  4 and 4    D)  3 and 2    E)  2 and 2

abhinav behal 15-Feb-2020

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