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The Periodic Table | IGCSE Chemistry (0620)

The Periodic Table | IGCSE Chemistry (0620) | SM-Educate
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CS-991 · Module I-8

8 · The Periodic Table

Cambridge IGCSE Chemistry 0620 · Core + Supplement · 2026–2028
Quick Revision
📊 Groups/Periods⛳️ Group I/VII/0

8.1 Groups, Periods, Metals and Non-metals

Elements are arranged in order of increasing atomic (proton) number. A group is a vertical column (same number of outer electrons, similar properties). A period is a horizontal row (properties change gradually across it).

Metals are on the left and centre; non-metals on the right. Metals tend to lose electrons to form positive ions; non-metals tend to gain electrons to form negative ions.

🎥 Video lectures for this sub-topic — coming soon
Q1: Elements in the same group have the same number of:
a) Protons b) Neutrons c) Outer shell electrons d) Total electron shells
Show Answer
✅ c) Outer shell electrons
Q2: Metals tend to:
a) Gain electrons b) Lose electrons c) Neither gain nor lose d) Always stay neutral
Show Answer
✅ b) Lose electrons

8.2 Group I, Group VII and Group 0 Trends

GroupNameKey Property
Group IAlkali MetalsReactivity increases down the group
Group VIIHalogensReactivity decreases down the group
Group 0 (VIII)Noble GasesFull outer shell, unreactive/inert

For Group I, going down, the outer electron is further away and more shielded — easier to lose, so reactivity increases. For Group VII, going down, the outer shell is further away, harder to attract an extra electron — reactivity decreases.

🎥 Video lectures for this sub-topic — coming soon
Q1: Reactivity of Group I metals as you go down the group:
a) Increases b) Decreases c) Stays the same d) Becomes zero
Show Answer
✅ a) Increases
Q2: Reactivity of Group VII halogens as you go down the group:
a) Increases b) Decreases c) Stays the same d) Becomes zero
Show Answer
✅ b) Decreases
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