CourseCourseConceptConcept

CAIE IGCSE Chemistry 2.2.5 Electronic Configuration of Elements Questions

Arrange electrons in shells for the first 20 elements and their ions in CAIE IGCSE Chemistry, using charge and particle data to write and compare configurations.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • Write shell configurations for atoms with proton numbers 1 to 20, including calcium as 2,8,8,2.
  • Account for electrons lost or gained to write the shell configuration of a stated ion.
  • Select atoms or ions with the same electronic configuration, checking their charges as well as atomic numbers.
  • Identify an element from its atomic configuration or from an ion's electron arrangement and charge.
  • Complete particle tables so that proton count, electron count, shell configuration and charge agree.

CAIE IGCSE Chemistry 2.2.5 Electronic Configuration of Elements Questions question 1

[Maximum number: 1]

What is the total number of electrons in one molecule of ammonia, NH3\mathrm{NH}_{3} ?

A

6

B

8

C

10

D

11

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