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CXC · CSEC · Chemistry

Atomic Structure
Practice Questions

20 CXC CSEC Chemistry questions on Atomic Structure, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Atomic Structure

Question 1 · 1 mark · Difficulty 1/3

Which particle in an atom has negligible mass?

  1. Proton
  2. Neutron
  3. Electron
  4. Nucleus
Show answer & explanation
✓ Answer: CElectron
Award 1 mark for C. The electron has a relative mass of 1/1840 (negligible compared to protons and neutrons). A is incorrect because protons have a relative mass of 1. B is incorrect because neutrons have a relative mass of 1. D is incorrect because the nucleus contains protons and neutrons and has significant mass.
Question 2 · 1 mark · Difficulty 2/3

A sample of chlorine gas from a chemical plant in Trinidad contains two isotopes: chlorine-35 and chlorine-37. Both isotopes have 17 protons. What is the difference between these isotopes?

  1. Number of protons
  2. Number of electrons in a neutral atom
  3. Number of neutrons
  4. Atomic number
Show answer & explanation
✓ Answer: CNumber of neutrons
Award 1 mark for C. Cl-35 has 18 neutrons (35-17) while Cl-37 has 20 neutrons (37-17). A is incorrect because isotopes have the same number of protons. B is incorrect because neutral atoms have equal numbers of protons and electrons, which are the same for isotopes. D is incorrect because isotopes have the same atomic number.
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20 questions · 25 min · free

CXC CSEC Chemistry: Atomic Structure FAQ

How many CXC CSEC Chemistry questions on Atomic Structure are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Atomic Structure for CXC CSEC Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC students preparing for Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Atomic Structure practice with other Chemistry topics or even switch to a totally different CXC subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Atomic Structure questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CXC.
How is Atomic Structure typically tested on CXC CSEC Chemistry papers?
Atomic Structure appears across multiple question types on real CXC CSEC Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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