Different elements.
Repeating patterns.
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Chemistry · Shared reference for Classes 8–10
Elements, patterns and discoveries
Browse all 118 elements below, or open your class’s Chemistry pathway.
Class 10 · 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.