Worksheet: Electron Configurations of Transition Elements

In this worksheet, we will practice using the periodic table to deduce the electron configurations of transition elements.

Q1:

Which atom has the electron configuration [Ar]34ds in its ground state?

  • ASm
  • BMn
  • CTc
  • DFe
  • ECr

Q2:

Which ion has a +2 charge and the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5?

  • AMn2+
  • BTc2+
  • CFe2+
  • DRh2+
  • ERu2+

Q3:

Which ion has a 3+ charge and the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5?

  • AFe3+
  • BRu3+
  • CRe3+
  • DCo3+
  • ERh3+

Q4:

Which of the following has the electronic configuration 1s2 2s2 2p6 3s2 3p6 3d5?

  • ASc2+
  • BCo2+
  • CCr3+
  • DV
  • EMn2+

Q5:

The f-block elements have more complex electron configuration rules than most of the periodic table. However, the electronic structure of terbium follows the same rules as main-group elements. What is the electronic configuration of the Tb atom?

  • A1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f8 5d1 6s2
  • B1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f10 6s1
  • C1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f9 6s2
  • D1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f11
  • E1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f8 5d2 6s1

Q6:

Which atom has the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2?

  • ACa
  • BSc
  • CGa
  • DTi
  • EGe

Q7:

Which of the following has exactly two valence electrons?

  • ASe2
  • BY
  • CZr2+
  • DCd
  • ESr2+

Q8:

Which atom has the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d2 5s2?

  • ASn
  • BSr
  • CZr
  • DY
  • EIn

Q9:

Which atom has the electron configuration 1223334sspspds?

  • ASc
  • BGe
  • CGa
  • DTi
  • ECa

Q10:

Which of the following has exactly two valence electrons?

  • AZr2+
  • BSe2
  • CCd
  • DSr2+
  • EY

Q11:

Which of the following atoms and ions has the electronic configuration 122333sspspd?

  • ACr3+
  • BMn2+
  • CSc2+
  • DCo2+
  • EV

Q12:

What is the electronic configuration of the Cr atom?

  • A1s2 2s2 2p6 3s2 3p6 3d4 4s1
  • B1s2 2s2 2p6 3s2 3p6 3d4
  • C1s2 2s2 2p6 3s2 3p6 3d4 4s2
  • D1s2 2s2 2p6 3s2 3p6 3d5
  • E1s2 2s2 2p6 3s2 3p6 3d5 4s1

Q13:

What is the electronic configuration of the Fe atom?

  • A122333sspspd
  • B122333sspspd
  • C1223334sspspds
  • D1223334sspspds
  • E1223334sspspds

Q14:

What is the electronic configuration of the Te atom?

  • A12233344455sspspdspdsp
  • B12233344454sspspdspdsf
  • C12233344455sspspdspdsp
  • D122333444554sspspdspdspf
  • E12233344455sspspdspdsp

Q15:

Thallium can form cations with charges of 1+ and 3+.

What is the electron configuration of Tl+?

  • A[Xe]fdsp4566
  • B[Xe]fdsp4566
  • C[Xe]fdsp4566
  • D[Xe]fds456
  • E[Xe]fdsp4566

What is the electron configuration of Tl3+?

  • A[Xe]fds456
  • B[Xe]fds456
  • C[Xe]fds456
  • D[Xe]fds456
  • E[Xe]fd45

Q16:

Which of the following represents the electron configuration for Cd2+?

  • A[Kr]d4
  • B12233434sspspsdp
  • C[Kr]sd54
  • D[Kr]sd54
  • E[Kr]sdp545

Q17:

The electron configuration of the gadolinium atom is [Xe]fds456. What is the electron configuration of Gd3+?

  • A[Xe]fds456
  • B[Xe]fs46
  • C[Xe]f4
  • D[Xe]fs46
  • E[Xe]fd45

Q18:

Which of the following atoms or ions possesses a full-valence s orbital in its ground state?

  • ACd
  • BZn2+
  • CPt
  • DCo+
  • EPb4+

Q19:

Which of the following atoms possesses a full-valence s orbital?

  • AAg
  • BAu
  • CW
  • DCu
  • ECr

Q20:

Which of the following transition metal complexes contains the most unpaired electrons in its ground-state configuration?

  • A[Zn(en)]22+
  • B[Co(CN)]63
  • C[Fe(CN)]42
  • D[FeF]63
  • E[V(CN)]63

Q21:

Which of the following orbital diagrams describes the electron configuration of the valence orbitals of the Fe3+ ion in the ground state?

  • A
    3d4s
  • B
    3d4s
  • C
    3d4s
  • D
    3d4s
  • E
    3d4s

Q22:

Which of the following orbital diagrams describes the electron configuration of the valence orbitals in the Mo atom in the ground state?

  • A
    4d5s
  • B
    4d5s
  • C
    4d5s
  • D
    4d5s
  • E
    4d5s

Q23:

Which of the following orbital diagrams describes the electron configuration of the valence orbitals in the La atom in its ground state?

  • A
    4f5d6s
  • B
    4f5d6s
  • C
    4f5d6s
  • D
    4f5d6s
  • E
    4f5d6s

Q24:

An atom of cadmium has 48 electrons. How many electrons occupy its 3d subshell?

Q25:

In the noble gas notation, what is the electronic configuration of the lead(II) ion?

  • A[Xe]6s2
  • B[Xe]6s5d4f6p210142
  • C[Xe]6p2
  • D[Xe]6s5d4f21014
  • E[Xe]5d4f6p10142

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