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SubjectsGeneral ScienceChemistryChapter 5 — Matter & Its Structure5.1 States of Matter

Topic 5.1 · General Science · Matter & Its Structure

States of Matter

States of Matter 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, states of matter 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

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)

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

Dmitri MendeleevNiels Bohr

Important Dates

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

Related topics

5.2 Atomic Structure & Periodic Table5.3 Chemical Bonding5.4 Acids, Bases & Salts
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