This 9th class chemistry chapter 2 test is an original ExamPaperDesk practice paper for Chapter 2, Atomic Structure. Every question is printed in both English and Urdu, so English medium and Urdu medium students can use the same paper. It carries 36 marks: 10 multiple-choice questions with a bubble sheet, 10 short questions of which you attempt any eight, and 2 detailed questions. An answer key for the MCQs is given at the end.
Before you attempt it, revise from the Class 9 Chemistry Chapter 2 textbook PDF and work through the Chapter 2 exercise questions. The Class 9 Chemistry section of ExamPaperDesk is organised into notes, test papers, online papers, guess papers, past papers and textbook PDFs, and you can already browse our Class 9 Chemistry notes and textbook PDFs.
How to Use This Chapter 2 Test
Print the paper or open it on your phone, close your book and attempt all three sections in one sitting, as you would in an exam. Fill in the bubble sheet for Section A, then check your MCQs against the answer key on the last page. For the short and detailed questions, compare your answers with the chapter in your textbook and note any topic you need to revise again.
Download the 9th Class Chemistry Chapter 2 Test PDF
What the Chapter 2 Test Covers: Atomic Structure
The paper is set across the whole of Chapter 2 rather than one exercise, so it is a fair check of whether the chapter is finished. Questions are drawn from:
- The fundamental particles of the atom and their relative charges and masses.
- Rutherford and Bohr atomic models, and the limitation each one addressed.
- Atomic number, mass number, and calculating the number of protons, neutrons and electrons.
- Isotopes, their uses, and the calculation of relative atomic mass.
- Electronic configuration of the first twenty elements and the shell capacity rule.
- Why atoms are electrically neutral.
Facts You Need Before Attempting It
Most of the marks in Atomic Structure hang on a small number of statements being exactly right:
- The proton and neutron sit in the nucleus; the electron orbits it. Protons and electrons carry equal and opposite charge.
- Mass number equals protons plus neutrons; atomic number equals protons alone, and in a neutral atom it also equals the electrons.
- Isotopes have the same atomic number but different mass numbers, so they differ in neutrons only.
Where Marks Go Missing in This Chapter
- Giving the neutron a charge.
- Confusing mass number with relative atomic mass.
- Filling electron shells beyond their capacity.
Frequently Asked Questions
What is an isotope?
An atom of the same element with the same number of protons but a different number of neutrons, so it has the same atomic number but a different mass number. Chemically isotopes behave identically.
Is the answer key included?
An answer key for the multiple-choice section is printed at the end of the paper. The written sections should be marked against your textbook and the solved chapter notes.
Related Class 9 Chemistry Resources
Continue with Chapter 1 test and Chapter 3 test. Everything for the subject is collected on the Class 9 Chemistry page, including the solved chapter notes and the rest of the Class 9 Chemistry test papers.