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ICSE Class 7 Chemistry Question 15 of 16

Atomic Structure — Question 3

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Question 3

Match the radicals in List I with their correct names from List II.

List IList II
1. NO31-A: Bisulphite
2. HSO41-B: Phosphate
3. SO42-C: Carbonate
4. PO43-D: Nitrite
5. HCO31-E: Bicarbonate
  F: Sulphate
  G: Nitrate
  H: Phosphite
  I: Sulphite
  J: Bisulphate
Answer
List IList II
1. NO31-G: Nitrate
2. HSO41-J: Bisulphate
3. SO42-F: Sulphate
4. PO43-B: Phosphate
5. HCO31-E: Bicarbonate

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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