CBSE Class 10 Science – Metals and Non-Metals Notes PDF (Exam-Focused Revision Guide) The chapter Metals and Non-Metals is where chemistry starts feeling more “real-world” than textbook theory. From the iron in bridges to the oxygen we breathe and the gold in jewellery, this chapter explains how elements behave differently and why those differences matter. It is one of the most concept-rich and scoring chapters in Class 10 Science, especially for board exams, because questions are often direct, logical, and NCERT-based. At padhayi, these notes are designed to make classification, reactions, and properties of elements simple, structured, and easy to revise. Why Metals and Non-Metals Is an Important Chapter This chapter builds the foundation of material science in chemistry. It explains why some elements shine and conduct electricity while others do not, and how they react with acids, oxygen, and water. This chapter helps you: Understand properties of metals and non-metals Learn chemical reactions of metals Study reactivity series Understand corrosion and its prevention Compare metals vs non-metals clearly In short, it teaches how elements behave in the real chemical world. Overview of Metals and Non-Metals Elements are broadly classified into two categories: Metals – generally hard, shiny, malleable, and good conductors Non-metals – generally soft or brittle, dull, and poor conductors However, there are exceptions, and understanding those exceptions is key to scoring well. Metals tend to lose electrons and form positive ions (cations). Non-metals tend to gain electrons and form negative ions (anions). Physical Properties of Metals Metals show a set of characteristic physical properties: Lustrous (shiny appearance) Good conductors of heat and electricity Malleable (can be beaten into sheets) Ductile (can be drawn into wires) Sonorous (produce sound when struck) Generally hard and have high melting points Examples include iron, copper, aluminium, and gold. Exceptions: Mercury is liquid at room temperature. Sodium and potassium are soft metals. Physical Properties of Non-Metals Non-metals behave very differently from metals. Dull appearance (non-lustrous) Poor conductors of heat and electricity Brittle in solid form Not malleable or ductile Low melting and boiling points (generally) Examples include oxygen, nitrogen, sulphur, and chlorine. Exception: Graphite (a form of carbon) conducts electricity. Chemical Properties of Metals Metals react in specific ways depending on the substance they interact with. Reaction with Oxygen Metals react with oxygen to form metal oxides. Example: 2Mg + O₂ → 2MgO Metal oxides are generally basic in nature. Some metals react vigorously with oxygen, while others react slowly. Reaction with Water Some metals react with water to produce metal hydroxide and hydrogen gas. Example: 2Na + 2H₂O → 2NaOH + H₂ Reactivity varies: Sodium reacts violently Iron reacts slowly Gold does not react Reaction with Acids Metals react with acids to produce salt and hydrogen gas. Example: Zn + H₂SO₄ → ZnSO₄ + H₂ Hydrogen gas is confirmed using a burning splint test (pop sound). Reactivity Series of Metals The reactivity series is an arrangement of metals in decreasing order of reactivity. Most reactive → Potassium, Sodium, Calcium Moderate → Zinc, Iron, Lead Least reactive → Silver, Gold, Platinum Importance of reactivity series: Predicts displacement reactions Helps understand extraction of metals Explains corrosion tendencies More reactive metals are easier to lose electrons. Extraction of Metals Metals are extracted based on their reactivity. Highly reactive metals → Electrolysis (e.g., sodium, potassium) Moderately reactive metals → Reduction using carbon (e.g., iron) Low reactive metals → Found in native state (e.g., gold, silver) This classification is important for understanding industrial processes. Ionic Compounds Metals and non-metals form ionic compounds by transfer of electrons. Example: NaCl formation: Sodium loses electron → Na⁺ Chlorine gains electron → Cl⁻ Oppositely charged ions attract to form ionic bond. Properties of ionic compounds: High melting and boiling points Conduct electricity in molten or aqueous state Hard and brittle nature Corrosion of Metals Corrosion is the slow destruction of metals due to reaction with air, moisture, or chemicals. Example: Rusting of iron: Iron + Oxygen + Water → Hydrated iron oxide Rust is reddish-brown in colour and weakens metal structures. Prevention of Corrosion Corrosion can be prevented using: Painting surfaces Oiling or greasing Galvanisation (zinc coating) Alloy formation These methods protect metals from air and moisture exposure. Alloys – Mixtures of Metals Alloys are homogeneous mixtures of two or more metals or a metal and a non-metal. Examples: Steel (iron + carbon) Brass (copper + zinc) Bronze (copper + tin) Advantages of alloys: Stronger than pure metals Resistant to corrosion Better mechanical properties Important Differences Between Metals and Non-Metals Metals: Conduct electricity well Form positive ions Generally hard and shiny Non-metals: Poor conductors Form negative ions Generally dull and brittle This comparison is frequently asked in exams. Important NCERT-Based Questions Most board questions come from: Reactivity series order Difference between metals and non-metals Rusting and corrosion prevention Ionic bond formation Properties of metal oxides Practicing NCERT is essential for full marks. Common Mistakes Students Make Students often lose marks due to: Confusing ionic and covalent bonding Not remembering reactivity series order Mixing physical and chemical properties Skipping exceptions like graphite or mercury Writing incomplete reaction equations Careful revision avoids these errors. How to Study This Chapter Effectively A simple approach works best: Learn properties first (metals vs non-metals) Memorise reactivity series in order Practice chemical reactions daily Revise corrosion and alloys regularly Solve NCERT back exercises and PYQs Understanding is more important than memorisation here. Final Thoughts The chapter Metals and Non-Metals builds a strong foundation for understanding how elements behave in chemistry and everyday life. Once you understand reactivity, bonding, and corrosion, the chapter becomes highly scoring and easy to revise. At padhayi, the goal is to turn chemistry into clear logic instead of memorised confusion so students can approach exams with confidence and clarity.