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?

  • A S m
  • B M n
  • C T c
  • D F e
  • E C r

Q2:

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

  • A M n 2 +
  • B T c 2 +
  • C F e 2 +
  • D R h 2 +
  • E R u 2 +

Q3:

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

  • A F e 3 +
  • B R u 3 +
  • C R e 3 +
  • D C o 3 +
  • E R h 3 +

Q4:

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

  • A S c 2 +
  • B C o 2 +
  • C C r 3 +
  • D V
  • E M n 2 +

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?

  • A C a
  • B S c
  • C G a
  • D T i
  • E G e

Q7:

Which of the following has exactly two valence electrons?

  • A S e 2
  • B Y
  • C Z r 2 +
  • D C d
  • E S r 2 +

Q8:

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

  • A S n
  • B S r
  • C Z r
  • D Y
  • E I n

Q9:

Which atom has the electron configuration 1223334sspspds?

  • A S c
  • B G e
  • C G a
  • D T i
  • E C a

Q10:

Which of the following has exactly two valence electrons?

  • A Z r 2 +
  • B S e 2
  • C C d
  • D S r 2 +
  • E Y

Q11:

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

  • A C r 3 +
  • B M n 2 +
  • C S c 2 +
  • D C o 2 +
  • E V

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?

  • A 1 2 2 3 3 3 s s p s p d
  • B 1 2 2 3 3 3 s s p s p d
  • C 1 2 2 3 3 3 4 s s p s p d s
  • D 1 2 2 3 3 3 4 s s p s p d s
  • E 1 2 2 3 3 3 4 s s p s p d s

Q14:

What is the electronic configuration of the Te atom?

  • A 1 2 2 3 3 3 4 4 4 5 5 s s p s p d s p d s p
  • B 1 2 2 3 3 3 4 4 4 5 4 s s p s p d s p d s f
  • C 1 2 2 3 3 3 4 4 4 5 5 s s p s p d s p d s p
  • D 1 2 2 3 3 3 4 4 4 5 5 4 s s p s p d s p d s p f
  • E 1 2 2 3 3 3 4 4 4 5 5 s s p s p d s p d s p

Q15:

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

What is the electron configuration of Tl+?

  • A[Xe] 4566fdsp
  • B[Xe] 4566fdsp
  • C[Xe] 4566fdsp
  • D[Xe] 456fds
  • E[Xe] 4566fdsp

What is the electron configuration of Tl3+?

  • A[Xe] 456fds
  • B[Xe] 456fds
  • C[Xe] 456fds
  • D[Xe] 456fds
  • E[Xe] 45fd

Q16:

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

  • A [ K r ] 4 d
  • B 1 2 2 3 3 4 3 4 s s p s p s d p
  • C [ K r ] 5 4 s d
  • D [ K r ] 5 4 s d
  • E [ K r ] 5 4 5 s d p

Q17:

The electron configuration of the gadolinium atom is [Xe] 4f7 5d1 6s2. What is the electron configuration of Gd3+?

  • A [ X e ] 4f4 5d16s2
  • B [ X e ] 4f5 6s2
  • C [ X e ] 4f7
  • D [ X e ] 4f6 6s1
  • E [ X e ] 4f6 5d1

Q18:

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

  • A C d
  • B Z n 2 +
  • C P t
  • D C o +
  • E P b 4 +

Q19:

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

  • A A g
  • B A u
  • C W
  • D C u
  • E C r

Q20:

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

  • A [ Z n ( e n ) ] 2 2 +
  • B [ C o ( C N ) ] 6 3
  • C [ F e ( C N ) ] 4 2
  • D [ F e F ] 6 3
  • E [ V ( C N ) ] 6 3

Q21:

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

  • A
    3 d 4 s
  • B
    3 d 4 s
  • C
    3 d 4 s
  • D
    3 d 4 s
  • E
    3 d 4 s

Q22:

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

  • A
    4 d 5 s
  • B
    4 d 5 s
  • C
    4 d 5 s
  • D
    4 d 5 s
  • E
    4 d 5 s

Q23:

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

  • A
    4 f 5 d 6 s
  • B
    4 f 5 d 6 s
  • C
    4 f 5 d 6 s
  • D
    4 f 5 d 6 s
  • E
    4 f 5 d 6 s

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 [ X e ] 6 s 2
  • B [ X e ] 6 s 5 d 4 f 6 p 2 1 0 1 4 2
  • C [ X e ] 6 p 2
  • D [ X e ] 6 s 5 d 4 f 2 1 0 1 4
  • E [ X e ] 5 d 4 f 6 p 1 0 1 4 2

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