Revision NotesExam QuestionsPast Papers
ASChemistryCIEExam Questions1. Atomic Structure1.3 Electrons, Energy Levels & Atomic Orbitals

Electrons, Energy Levels & Atomic Orbitals (CIE AS Chemistry)

Exam Questions

47 mins16 questions

Select a question set to download for
1.3 Electrons, Energy Levels & Atomic Orbitals

Select an answer set to view for
1.3 Electrons, Energy Levels & Atomic Orbitals

Easy
Medium
Hard
11 mark

Which of the following statements describes a free radical?

  • A species with a lone pair of electrons

  • A species with a half-filled d-orbital

  • A species with one or more unpaired electrons

  • A species with a partially filled outer shell

Choose your answer

Did this page help you?

21 mark

This question refers to isolated gaseous species.

The species O2-, Ne and Mg2+ are isoelectronic. 

In which order do their radii increase?

 

Smallest               begin mathsize 28px style rightwards arrow end style                  Largest             

A

B

C

D

Mg2+

Ne 

Mg2+

O2-

O2-

O2-

Ne

Ne

Ne 

Mg2+

O2-

Mg2+

    Choose your answer

    Did this page help you?

    31 mark

    Which of the following has a complete subshell?

    • Mg

    • Si

    • Co

    • Cl

    Choose your answer

    Did this page help you?

    11 mark

    There are six unpaired electrons in atoms of element Z. What could element Z be?

    • Sulfur

    • Iron

    • Carbon

    • Chromium

    Choose your answer

    Did this page help you?

    21 mark

    The diagram shows three orbitals labelled 1, 2 and 3.

    1-1-q17-s-and-p-orbitals

    What is the correct label for each orbital?

    • px, py and pz

    • s, pz and py

    • s, px and pz

    • s, px and py

    Choose your answer

    Did this page help you?

    31 mark

    What is the electronic configuration of the ion with a single negative charge and the atomic number 17?

    • 1s2 2s2 2p6 3s1 3p6

    • 1s2 2s2 2p6 3s2 3p6

    • 1s2 2s2 2p6 3s1 3p5

    • 1s2 2s2 2p6 3s2 3p5

    Choose your answer

    Did this page help you?

    41 mark

    What is the correct sequence for the orbitals shown in an atom of vanadium in order of decreasing energy?

    • 3s 3p 4s 3d

    • 4s 3d 3s 3p

    • 4s 3d 3p 3s

    • 3d 4s 3p 3s

    Choose your answer

    Did this page help you?

    51 mark

    What is the electronic configuration of the ion with a single negative charge and the atomic number 35?

    • 1s2 2s2 2p6 3s1 3p6

    • 1s2 2s2 2p6 3s2 3p5

    • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

    • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

    Choose your answer

    Did this page help you?

    11 mark

    Which species produces a half-filled set of p orbitals on losing an electron?

    • Li+

    • F

    • N

    • N-

    Choose your answer

    Did this page help you?

    21 mark

    Which statement explains why electrons pair up in orbitals before occupying an orbital of a higher energy level?

    • The energy from repulsion is greater than the jump to a higher orbital.

    • Electrons occupy higher energy orbitals before lower energy orbitals.

    • Electrons in lower orbitals have higher energies.

    • The energy from repulsion is less than the jump to a higher orbital.

    Choose your answer

    Did this page help you?

    31 mark

    A charged particle has the electronic configuration [Ar]3d3.

    What is the identity of the particle?

    • Cr+

    • V3+

    • Ti2+

    • V2+

    Choose your answer

    Did this page help you?