Skip to main content
Super TutorResources
Chapter 3 of 12
QuestionsNotesFlashcardsSummaryFormulasQuizConceptsSyllabusPlan
Revision Notes

Atoms and Molecules

Haryana Board · Class 9 · Science

Quick revision notes for Atoms and Molecules — Haryana Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

29 questions24 flashcards5 concepts

Interactive on Super Tutor

Studying Atoms and Molecules? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.

Try Super Tutor — Free

1,000+ Class 9 students started this chapter today

An infographic summarizing the key postulates of Dalton's Atomic Theory, which laid the foundation for modern chemistry.
Super Tutor

This is just one of 12+ visuals inside Super Tutor's Atoms and Molecules chapter

Explore the full set

Key Topics to Revise

1

Historical Background and Laws of Chemical Combination

  • Ancient Indian philosopher Maharishi Kanad (500 BC) proposed the concept of 'Parmanu' - smallest indivisible particles
  • Greek philosophers Democritus and Leucippus called indivisible particles 'atoms' (meaning indivisible)
  • Antoine Lavoisier established the foundation of chemical sciences through experimental work
2

Dalton's Atomic Theory

  • John Dalton (1766-1844) provided the first scientific atomic theory
  • Theory explained both laws of chemical combination through atomic concepts
  • Six main postulates form the foundation of atomic theory
3

Atoms - Structure and Properties

  • Atoms are extremely small - millions stacked would be as thick as paper
  • Atomic radius measured in nanometers (1 nm = 10⁻⁹ m)
  • Each element has unique symbols following IUPAC conventions
4

Molecules and Their Types

  • Molecules are groups of two or more atoms bonded together
  • Can be formed from same element atoms or different element atoms
  • Atomicity refers to number of atoms in a molecule

Get complete notes with diagrams and examples

Full Notes

Key Concepts

Two fundamental laws govern chemical reactionsJohn Dalton proposed that all matterAtoms are extremely small particles (radiusMolecules are groups of atoms heldIons are charged particles formed when

Frequently Asked Questions

What are the important topics in Atoms and Molecules for Haryana Board Class 9 Science?
Atoms and Molecules covers several key topics that are frequently asked in Haryana Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Atoms and Molecules — Haryana Board Class 9 Science?
Understand the core concepts first, then work through the 29 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Atoms and Molecules

All 12 chapters — Haryana Board Class 9 Science Revision Notes

For serious students

Get the full Atoms and Molecules chapter — for free.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for Haryana Board Class 9 Science.

Try Super Tutor Free
Try the full chapter — Free