Class 9 Science — Chapter 4: Structure of the Atom
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 9 Science, Chapter 4 (Structure of the Atom). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Which subatomic particle carries a positive charge?
Proton: +1. Electron: −1. Neutron: 0.
Maximum number of electrons that can be accommodated in the K shell (n=1) is:
Capacity = 2n². For n=1: 2 × 1² = 2.
The valency of an element with electronic configuration 2, 8, 1 is:
Outer shell has 1 electron (Na). Valency = 1 (loses 1 electron).
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