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 [ A r ] 3d5 4s2 in its ground state?

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

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 R u 2 +
  • C F e 2 +
  • D T c 2 +
  • E R h 2 +

Q3:

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

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

Q4:

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

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

Q5:

What is the electronic configuration of the C r atom?

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

Q6:

What is the electronic configuration of the C u + ion?

  • A1s2 2s2 2p6 3s2 3p6 3d9 4s1
  • B1s2 2s2 2p6 3s2 3p6 3d10 4s1
  • C1s2 2s2 2p6 3s2 3p6 3d9
  • D1s2 2s2 2p6 3s2 3p6 3d10
  • E1s2 2s2 2p6 3s2 3p6 3d9 4s2

Q7:

What is the electronic configuration of the F e atom?

  • A1s2 2s2 2p6 3s2 3p6 3d6
  • B1s2 2s2 2p6 3s2 3p6 3d7 4s1
  • C1s2 2s2 2p6 3s2 3p6 3d5
  • D1s2 2s2 2p6 3s2 3p6 3d6 4s2
  • E1s2 2s2 2p6 3s2 3p6 3d4 4s2

Q8:

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 T b atom?

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

Q9:

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

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

Q10:

Which of the following has exactly two valence electrons?

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

Q11:

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

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

Q12:

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

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

Q13:

Which of the following has exactly two valence electrons?

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

Q14:

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

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

Q15:

What is the electronic configuration of the C r atom?

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

Q16:

What is the electronic configuration of the C u + ion?

  • A1s2 2s2 2p6 3s2 3p6 3d9 4s1
  • B1s2 2s2 2p6 3s2 3p6 3d10 4s1
  • C1s2 2s2 2p6 3s2 3p6 3d9
  • D1s2 2s2 2p6 3s2 3p6 3d10
  • E1s2 2s2 2p6 3s2 3p6 3d9 4s2

Q17:

What is the electronic configuration of the F e atom?

  • A 1 2 2 3 3 3 s s p s p d 2 2 6 2 6 6
  • B 1 2 2 3 3 3 4 s s p s p d s 2 2 6 2 6 7 1
  • C 1 2 2 3 3 3 s s p s p d 2 2 6 2 6 5
  • D 1 2 2 3 3 3 4 s s p s p d s 2 2 6 2 6 6 2
  • E 1 2 2 3 3 3 4 s s p s p d s 2 2 6 2 6 4 2

Q18:

What is the electronic configuration of the T e atom?

  • A 1 2 2 3 3 3 4 4 4 5 5 s s p s p d s p d s p 2 2 6 2 6 1 0 2 6 1 0 2 6
  • B 1 2 2 3 3 3 4 4 4 5 5 s s p s p d s p d s p 2 2 6 2 6 1 0 2 6 1 0 2 2
  • C 1 2 2 3 3 3 4 4 5 5 4 s s p s p d s 4 p d s p f 2 2 6 2 6 1 0 2 6 1 0 2 2 2
  • D 1 2 2 3 3 3 4 4 4 5 5 s s p s p d s p d s p 2 2 6 2 6 1 0 2 6 1 0 2 4
  • E 1 2 2 3 3 3 4 4 5 4 s s p s p d s 4 p d s f 2 2 6 2 6 1 0 2 6 1 0 2 4

Q19:

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

What is the electron configuration of T l + ?

  • A[ X e ] 4 5 6 6 f d s p 1 4 1 0 1 1
  • B[ X e ] 4 5 6 6 f d s p 1 3 1 0 2 1
  • C[ X e ] 4 5 6 6 f d s p 1 4 9 2 1
  • D[ X e ] 4 5 6 f d s 1 4 1 0 2
  • E[ X e ] 4 5 6 6 f d s p 1 3 9 2 2

What is the electron configuration of T l 3 + ?

  • A[ X e ] 4 5 f d 1 4 1 0
  • B[ X e ] 4 5 6 f d s 1 3 1 0 1
  • C[ X e ] 4 5 6 f d s 1 4 8 2
  • D[ X e ] 4 5 6 f d s 1 4 9 1
  • E[ X e ] 4 5 6 f d s 1 3 9 2

Q20:

Which of the following represents the electron configuration for C d 2 + ?

  • A [ K r ] 5s24d105p2
  • B [ K r ] 5s24d8
  • C1s22s22p63s23p64s23d104p6
  • D [ K r ] 4d10
  • E [ K r ] 5s14d9

Q21:

The electron configuration of the gadolinium atom is [ X e ] 4f7 5d1 6s2. What is the electron configuration of G d 3+?

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

Q22:

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

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

Q23:

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

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

Q24:

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

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

Q25:

Which of the following orbital diagrams describes the electron configuration of the valence orbitals in the ground-state F e 3 + ion?

  • 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

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