Elements, Compounds, Symbols and Formulae — Revision Notes
ICSE · Class 6 · Chemistry
Elements, Compounds, Symbols and Formulae revision notes for ICSE Class 6 Chemistry: 4 topics in quick points. Part of the ICSE Class 6 Chemistry syllabus.
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Key Topics to Revise
Pure Substances: Elements and Compounds
- A pure substance has a fixed composition and consistent properties throughout.
- Pure substances are of two types: elements and compounds.
- Elements are made of only one kind of atom and cannot be broken down further by physical or chemical means.
Classification of Elements
- Elements are classified into four types: metals, non-metals, metalloids, and noble gases.
- Metals are shiny, malleable, ductile, and good conductors of heat and electricity (except mercury, which is liquid).
- Non-metals are generally dull, brittle, poor conductors, and can be solids, liquids, or gases (bromine is liquid).
Symbols and Formulae
- Each element has a symbol — usually the first letter or first two letters of its name.
- If the symbol comes from Latin, it may not match the English name (e.g., Na for sodium from Natrium).
- A molecular formula shows the types and numbers of atoms in a molecule.
Atoms and Molecules
- An atom is the smallest particle of an element that retains its properties.
- A molecule is the smallest particle of an element or compound that can exist independently.
- Molecules of elements contain same type of atoms (e.g., O₂, H₂).
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