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Atomic Structure — Revision Notes

ICSE · Class 7 · Chemistry

Atomic Structure revision notes for ICSE Class 7 Chemistry: 4 topics in quick points. Part of the ICSE Class 7 Chemistry syllabus.

43 questions40 flashcards4 formulas & key relations5 concepts

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A table showcasing elements that exhibit variable valency, providing examples of their different valencies and the corresponding names of compounds using both 'ous/ic' suffixes and Roman numerals.
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Key Topics to Revise

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1. Atom and Subatomic Particles

  • The word atom comes from atomos, meaning indivisible, coined by Democritus.
  • Maharishi Kannada proposed that matter consists of indestructible particles called Paramanus.
  • John Dalton suggested in 1808 that the atom is the basic unit of matter.
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2. Molecules and Atomicity

  • A molecule is the smallest particle of a pure substance that has independent existence.
  • A molecule is formed when two or more atoms of the same element or different elements chemically combine.
  • Atoms always join in whole numbers to form molecules.
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3. Radicals and Their Types

  • A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it.
  • Radicals are also called ions.
  • Ions are electrically charged atoms or groups of atoms formed by losing or gaining electrons.
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4. Valency and Formula Writing

  • Valency is the combining capacity of an element or of a radical.
  • Valency can be defined as the number of hydrogen atoms that will combine with or displace one atom of that element or radical.
  • Valency of hydrogen is taken as 1.

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Full Notes

Key Concepts

An atom is the smallest particleAn atom contains electronsThe number of protons inA molecule is the smallest particleAtomicity is the number of atoms

Frequently Asked Questions

What are the important topics in Atomic Structure for ICSE Class 7 Chemistry?
Key topics in Atomic Structure include Atom and Subatomic Particles, Molecules and Atomicity, Radicals and Their Types, Valency and Formula Writing. Study these first, then practise questions on each for Class 7 exams.
How should I revise Atomic Structure for Class 7 exams?
Learn the core ideas first, then work through the 43 practice questions on Atomic Structure. Revise 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.

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All ICSE Class 7 Chemistry Revision Notes

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