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ICSE Class 7 Chemistry Question 9 of 16

Metals and Non-metals — Question 8

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Question 8

Give the basic demarcation of the Modern Periodic Table into metals, metalloid and non-metals with special reference to halogens and noble gases.

Answer

In the Modern Periodic Table:

  • Strong metals are in the extreme left, weak metals are in the middle.
  • Metalloids are in the middle right.
  • Non-metals are to the right in the upper right hand corner.
    • Halogens are present in Group 17 which is the second last group of the periodic table.
    • Noble gases are present in Group 18 which is the last group of the periodic table.

ICSE Class VII Chemistry Chapter 5 14 Marks

Metals and Non-Metals — Quick Study Guide

Elements are broadly classified as metals, non-metals, or metalloids based on their physical and chemical properties.

Key Properties

  • Metals: Lustrous, malleable, ductile, sonorous, good conductors, high density
  • Non-metals: Dull, brittle, poor conductors, non-sonorous, low density
  • Metalloids: Properties of both (e.g., Silicon, Germanium)

Chemical Reactions

  • Metal + O2 → Basic oxide (turns red litmus blue)
  • Non-metal + O2 → Acidic oxide (turns blue litmus red)
  • Metal + Acid → Salt + H2

Exam Tips

  • Know all exceptions: Mercury (liquid), Graphite (conducts), Diamond (lustrous), Na/K (soft)
  • Learn the comparison table (8 properties) thoroughly
  • Practice writing equations for metal reactions
  • Know uses of at least 5 metals and 5 non-metals

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