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ICSE Class 7 Chemistry Question 13 of 16

Atomic Structure — Question 7

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7
Question

Question 6b

Name one ion for each of the valencies -1, -2 and -3.

Answer

Fluoride ion (F-) has valency -1.

Sulphide ion (S2-) has valency -2.

Nitride ion (N3-) has valency -3.

Source: This question is from Atomic Structure, Chemistry — Class 7, ICSE Board.

Key Concepts Covered

This question tests your understanding of the following concepts from the chapter Atomic Structure: Question, Ion, Valencies, Atomic Structure, Chemistry. These are fundamental topics in Chemistry that students are expected to master as part of the ICSE Class 7 curriculum.

A thorough understanding of these concepts will help you answer similar questions confidently in your ICSE examinations. These topics are frequently tested in both objective and subjective sections of Chemistry papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.

How to Approach This Question

Read the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.

Key Points to Remember

  • Balance chemical equations before solving numerical problems.
  • Learn the periodic table trends and exceptions.
  • Understand reaction mechanisms, not just outcomes.
  • Use correct IUPAC nomenclature in your answers.

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ICSE Class VII Chemistry Chapter 3 15 Marks

Atomic Structure — Quick Study Guide

Atoms are the building blocks of all matter. Understanding atomic structure is essential for all of chemistry.

Key Definitions

  • Atom: Smallest particle of an element with its chemical properties
  • Molecule: Group of two or more atoms bonded together
  • Element: Pure substance with only one type of atom
  • Compound: Two or more different elements chemically combined
  • Atomic number (Z): Number of protons = Number of electrons
  • Mass number (A): Protons + Neutrons
  • Valency: Combining capacity of an element
  • Isotopes: Same element, different mass numbers

Electronic Configuration Rules

K shell = max 2 electrons, L shell = max 8, M shell = max 8 (for first 20 elements). Fill inner shells first.

Exam Tips

  • Memorise symbols of first 20 elements
  • Practice calculating protons, neutrons, electrons from Z and A
  • Practice drawing Bohr diagrams
  • Valency: if outermost ≤ 4, valency = outermost; if > 4, valency = 8 - outermost

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