What is the maximum electron capacity of the third shell?
- 18
- 8
- 10
- 32
Answer / جواب
18
Class 9 Chemistry Chapter 2 MCQs — Atomic Structure
Class 9 Chemistry · Chapter 2 · Retained syllabus for Annual 2027
Practise this chapter online, check each answer and review your result. The current bank contains 6 objective questions for this chapter and medium.
Sample practice questions
Which particles were identified through discharge-tube studies in the textbook account?
- Electrons and positive particles
- Neutrons only
- The atomic nucleus
- Photons only
Answer / جواب
Electrons and positive particles
Which oxygen isotope has equal numbers of protons, electrons and neutrons in a neutral atom?
- Oxygen-16
- Oxygen-17
- Oxygen-18
- Oxygen-15
Answer / جواب
Oxygen-16
Using mass numbers 14 and 15 and abundances 99.64% and 0.36%, what is nitrogen's weighted mean mass?
- 14.0036 u
- 14.36 u
- 14.64 u
- 15.0036 u
Answer / جواب
14.0036 u
Printable practice
Use custom mode for a chapter paper. Board Annual mode uses the complete prescribed syllabus and published question distribution for supported subjects.