The Periodic Table and trends across a period
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The teaching part (1 min) is free to watch. A free account opens the whole lecture: 3 worked examples, 6 practice questions, 2 real past-paper questions with the answers explained, the mistakes that lose marks, the full-marks tip, a one-card summary and a quick quiz.
What this lecture covers
- A map of the elements
- How it is arranged
- What position tells you
Read the transcript of the teaching part
Last time
Before we start: last time, in Noble gases and transition elements, you learned these points. Here they are again on one card. Keep them in mind, because today builds on them.
A map of the elements
More than a hundred elements, and you do not have to learn them one by one. The Periodic Table is a map that puts similar elements together. With it you can predict an element's properties before you ever meet it.
How it is arranged
The elements are arranged in order of increasing proton number, also called atomic number. A horizontal row is a period. A vertical column is a group. Elements in the same group have similar chemical properties.
What position tells you
The group number is the number of outer shell electrons, for Groups I to VII. Group VIII, the noble gases, has a full shell. The period number is the number of electron shells. So sodium, 2,8,1, is in Group I and Period 3.
How often it comes up
How often Cambridge has asked each part, counted by ExamYard from every past paper in its question bank: Trends across a period · Trends across a period and down a group.
The whole chapter: The Periodic Table, The Periodic Table.
Chapter 8: The Periodic Table
- The Periodic Table and trends across a period 6 min
- Group I metals 6 min
- Halogens and displacement reactions 6 min
- Noble gases and transition elements 6 min
Also for IGCSE Chemistry 0620
Which topics come up most in IGCSE Chemistry 0620 past papers, counted from every paper since 2004.