Worksheet: Electron Configurations of Main Group Elements

In this worksheet, we will practice using the periodic table to deduce the electron configurations of main group (s- and p-block) elements.

Q1:

Which of the following is not a possible electronic configuration of the P atom?

  • A122333sspspd
  • B122333sspspd
  • C122333sspspd
  • D122333sspspd
  • E122333sspspd

Q2:

Which atom has the electron configuration [Kr]4d5s5p1026 in its ground state?

  • APo
  • BRn
  • CHg
  • DXe
  • ETe

Q3:

Which of the following orbital diagrams describes the electron configuration of the valence shell in the ground-state Na atom?

  • A
    3p3s
  • B
    3p3s
  • C
    3p3s
  • D
    3p3s
  • E
    3p3s

Q4:

Which of the following orbital diagrams describes the electron configuration of the valence shell in the ground-state phosphide ion?

  • A
    3p3s
  • B
    3p3s
  • C
    3p3s
  • D
    3p3s
  • E
    3p3s

Q5:

Which of the following orbital diagrams describes the electron configuration of the valence shell in the ground-state Al2+ ion?

  • A
    3p3s
  • B
    3p3s
  • C
    3p3s
  • D
    3p3s
  • E
    3p3s

Q6:

What is the electronic configuration of the Na+ ion?

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

Q7:

What is the electronic configuration of the Sn2+ ion?

  • A1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2
  • B1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2
  • C1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1 5p1
  • D1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1 5p2
  • E1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4

Q8:

Which of the following has the electronic configuration 1s2 2s2 2p6 3s2 3p5?

  • AS2
  • BF
  • CCl
  • DK+
  • EF

Q9:

What is the electronic configuration of the N atom?

  • A1s2 2s1 2p4
  • B1s2 2s2 2p4
  • C1s2 2s2 2p3
  • D1s2 2s2 2p6
  • E1s2 2s1 2p3

Q10:

What is the electronic configuration of the Si atom?

  • A1s2 2s2 2p6 3s2 3p2
  • B1s2 2s2 2p6 3s2 3p3
  • C1s2 2s2 2p6 3s2 3p4
  • D1s2 2s2 2p6 3s1 3p3
  • E1s2 2s2 2p6 3s2 3p6

Q11:

What is the electronic configuration of the Te atom?

  • A1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2 4f2
  • B1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4
  • C1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
  • D1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2
  • E1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 4f4

Q12:

An ion has the electron configuration 1s2 2s2 2p6 3s2 3p6. Which of the following pieces of information would not allow this ion to be precisely identified?

  • AIonic radius
  • BIonization energy
  • CCharge
  • DAtomic mass
  • EAtomic number

Q13:

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

  • AZr
  • BY
  • CIn
  • DSr
  • ESn

Q14:

Which of the following has exactly two unpaired electrons?

  • ACl
  • BMg
  • CAl
  • DSi
  • EP

Q15:

Which atom would be expected to have a half-filled 5p subshell?

  • AAs
  • BBi
  • CGe
  • DSn
  • ESb

Q16:

Which atom would be expected to have a half-filled 4s subshell?

  • ACa
  • BGe
  • CSc
  • DZn
  • EK

Q17:

Which atom or ion is isoelectronic with Br+?

  • ASe2+
  • BAs
  • CGa3+
  • DKr
  • ESe

Q18:

Which atom or ion is isoelectronic with P2+?

  • AMg+
  • BS+
  • CAl
  • DMg
  • ESi

Q19:

What is the name and chemical symbol for the most stable ion of magnesium?

  • AMagnesite ion, Mg2
  • BMagnesium ion, Mg2+
  • CMagnesium ion, Mg+
  • DMagnesium ion, Mg2
  • EMagnesite ion, Mg+

Q20:

What is the name and chemical symbol for the most stable ion of nitrogen?

  • ANitrogen ion, N
  • BNitrogen ion, N3
  • CNitride ion, N3+
  • DNitrogen ion, N3+
  • ENitride ion, N3

Q21:

What is the name and chemical symbol of the most stable ion of aluminum?

  • AAluminum ion, Al
  • BAluminum ion, Al+
  • CAluminum ion, Al3+
  • DAluminate ion, Al3+
  • EAluminate ion, Al

Q22:

What is the name and chemical symbol for the most stable ion of carbon?

  • ACarbon ion, C4+
  • BCarbide ion, C4
  • CCarbide ion, C2
  • DCarbide ion, C4+
  • ECarbon ion, C2+

Q23:

An ionic compound consists entirely of aluminum and oxygen. What is the likely empirical formula of this compound?

  • AAlO23
  • BAlO
  • CAlO3
  • DAlO2
  • EAlO32

Q24:

An ionic compound entirely consists of sodium and sulfur. What is the likely empirical formula of this compound?

  • ANaS3
  • BNaS
  • CNaS32
  • DNaS2
  • ENaS2

Q25:

Which of the following has exactly two unpaired electrons?

  • AP
  • BCl
  • CSi
  • DAl
  • EMg

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