GCSE · Chemistry · AQA · Spec 8462
The periodic table
The periodic table is more than a list of elements: where an element sits gives clues about its electrons and its chemistry.
Chemistry · Periodic table
Read the periodic table as a map
Atomic number gives the order; rows are periods; columns are groups.
Tap any cell to load its data into the panel. Tap a lens to highlight a chemical family.
Read a position in three moves
Do not jump into detailed group trends; stay with the structure of the table.
Why does 'periodic' matter?
Focus on the repeating pattern of similar properties.
Two elements are in the same group. Which prediction is justified from this page?
Predict from position — but don't overclaim
This page supports family-level predictions, not detailed down-group trends.
An unfamiliar element is placed in the same group as an element whose reactions you know. What is the safest prediction?
WHAT YOU'VE LEARNED
A quick recap of today's lesson.
What you need to know
- Elements are ordered by increasing atomic (proton) number.
- Period = horizontal row. Group = vertical column.
- Elements in the same group have the same number of outer-shell electrons and therefore similar chemical properties.
- An element's position is linked to its electron arrangement and atomic number.
- Metals form positive ions and are mainly towards the left/bottom; non-metals are mainly towards the right/top.
- Use position to make cautious predictions about possible reactions and probable reactivity, without importing detailed group trends.
The big picture
The periodic table arranges elements by increasing atomic number. Horizontal rows are periods and vertical columns are groups. Elements in the same group have the same number of outer-shell electrons, so they tend to have similar chemical properties. Position is linked to electron arrangement and atomic number, so it can be used to make bounded predictions about an unfamiliar element's behaviour. Elements that form positive ions are metals and lie mainly towards the left and bottom; non-metals lie mainly towards the right and top.
Key points
Worked example
Problem
Element X is directly below another element in the same group. What broad predictions can you make about X without using a detailed down-group trend?
⚠ Watch out
Treating a group as a horizontal row, or using a detailed group trend that this lesson has not taught. Groups are vertical columns; periods are horizontal rows.
★ Exam tip
For AQA Chemistry, keep predictions on this page tied to position, electron arrangement and broad chemical similarity. Do not import detailed Group 0, 1 or 7 trends or transition-metal properties from their separate specification sections.
Memory hook
Read the table like coordinates: across tells you the period, down tells you the group; the position points back to the electron arrangement and forward to the chemistry.
Check yourself
Two elements are in the same group. What does that tell you about their outer-shell electrons and their chemical properties?
Flashcards
(12)In what order are the elements arranged in the periodic table?
What is a period in the periodic table?
What is a group in the periodic table?
Why is the table called 'periodic'?
What do elements in the same group have in common in their electron arrangements?
Why do elements in the same group have similar chemical properties?
Why can an element's position in the periodic table tell you about its electron arrangement?
Where are metals found in the periodic table?
Where are non-metals found in the periodic table?
How does ion formation distinguish metals from non-metals in this topic?
Two elements are in the same group. What broad prediction can you make about their chemistry?
Why can position in the periodic table help predict an element's reactions and reactivity?
Tap any card to flip it, or use Study as deck to go through them one at a time. In the full lesson these run as a spaced-repetition deck — you rate each card Hard, Good or Easy and the tricky ones keep coming back until they stick.
Learning with Lightbulb is opening soon
You can use this lesson now. Join the waitlist and we'll let you know when the full Lightbulb experience is ready.
Keep me postedMore AQA GCSE Chemistry topics
- Alternative methods of extracting metals (HT)
- Atmospheric pollutants from fuels
- Atom economy
- Atoms, elements and compounds
- Calculating rates of reactions
- Carboxylic acids (chem only)
- Cells and batteries (chem only)
- Chemical bonds (ionic, covalent, metallic)
- Collision theory and activation energy
- Concentration in mol/dm3 (chem HT)
- Conservation of mass and balanced equations
- Covalent bonding
How this lesson was checked. This AQA GCSE Chemistry (specification 8462)lesson was published through Lightbulb Learning's human-designed editorial process — the educational standards, accuracy rules and publication checks it must pass were authored and approved by Philip Halpin. It passed subject-specific assessment, automated educational checks and technical publication verification before going live (publication checks completed 26 August 2026). Published pages are monitored, human spot-checking is ongoing across the lesson library, and anything found wrong is corrected or withdrawn. How our lessons are made and checked. Spotted a mistake? Email hello@lightbulblearning.co and we'll review it.