States and Properties of Matter

Where this fits in the syllabus

Grade 10 · Term 1

Key points to revise

Revise States and Properties of Matter fast with concise, exam-ready key points

About O/L Science: O/L Science integrates physics, chemistry, and biology into a single subject across Grade 10 and 11.

• Atom = nucleus (protons + neutrons) + electron cloud
• Atomic number = number of protons; defines the element
• Mass number = protons + neutrons
• Isotopes: same element, different neutron count (e.g. C-12, C-14)

Must know

• Periodic table arranged by increasing atomic number
• Elements in the same group have the same valence electrons → similar properties
• Matter states: solid (fixed shape/volume), liquid (fixed volume), gas (neither fixed)
• State changes involve energy exchange — not chemical change

Source: NIE O/L Science Grade 10 — Unit 7: Structure of Matter

Builds toward

Related Topics

In the Syllabus