Different elements.
Repeating patterns.
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Class 9 · Chemistry
Periodic table
Interactive explanation Gamified quiz, feedback & rewards
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Shared reference · Learning goals & preparation
By the end, you can…
- Locate an element using its atomic number, group and period.
- Compare element properties and distinguish atomic number from mass.
- Apply these patterns in the three-round element quest.
Useful preparation: Counting particles, ratios and the difference between a model and a real substance. Suggested previous stop: Boyle’s law.
The table is shared across classes for exploration and reference.
Class 9 · 3 quiz rounds
Groups run vertically (1–18). Periods run horizontally (1–7). Scroll sideways to explore the full table.
123456789101112131415161718123456757–71
↙89–103
↙Period 6 · Lanthanoids →Period 7 · Actinoids →
↙89–103
↙Period 6 · Lanthanoids →Period 7 · Actinoids →
Atomic number = number of protons. The detached rows belong in periods 6 and 7; their group assignments are omitted in this compact layout. Family colours are teaching categories.
01 · Groups
Look down a column
Elements in a group often have related chemistry. For main-group elements, similar outer-electron arrangements help explain the pattern.
02 · Periods
Read across a row
Atomic number increases across each period. The repeating arrangement reflects the way electrons fill available states.
03 · Compare
Find an exception
Hydrogen sits in group 1 but behaves differently from the alkali metals. Chemical families describe patterns, with important exceptions.