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SubjectsGeneral ScienceChemistryChapter 5 — Matter & Its Structure5.2 Atomic Structure & Periodic Table

Topic 5.2 · General Science · Matter & Its Structure

Atomic Structure & Periodic Table

Atomic Structure & Periodic Table is studied as part of "Matter & Its Structure" (Chemistry) in General Science. States of matter, the atomic structure, the periodic table and chemical bonding explain how substances are formed and transformed.

In the examination context, atomic structure & periodic table carries conceptual questions that test both factual recall and analytical understanding. Revise this topic in sequence with the rest of the chapter so that chronological and thematic links are clear.

Important Facts

Periodic law
Properties repeat periodically with atomic number
Covalent bond
Sharing of electron pairs
pH scale
Measures acidity/alkalinity (0–14)
Atomic number
Number of protons

Key Points

  • Atomic number — Number of protons
  • Periodic law — Properties repeat periodically with atomic number
  • Covalent bond — Sharing of electron pairs
  • pH scale — Measures acidity/alkalinity (0–14)

Important Names

Niels BohrDmitri Mendeleev

Important Dates

1913Bohr's atomic model
1869Mendeleev's periodic table
Exam-Oriented Notes
  • »pH < 7 acidic, pH = 7 neutral, pH > 7 basic. The periodic table is arranged by atomic number.

Related topics

5.1 States of Matter5.3 Chemical Bonding5.4 Acids, Bases & Salts
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