Matter, Elements and Compounds — O/L Science

What must I remember about Matter, Elements and Compounds?

• 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)

Test yourself (1 minute)

1. Matter states

   solid (fixed shape/volume), liquid (fixed volume), gas (neither fixed)

Practise Matter, Elements and Compounds questions today

Must know

• Periodic table arranged by increasing atomic number
• Elements in the same group have the same valence electrons → similar properties
• State changes involve energy exchange — not chemical change

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

What comes next?

Next in the syllabus

Where does Matter, Elements and Compounds fit in the syllabus?

Grade 10 · Term 1