Chemistry · Shared reference for Classes 8–10

Elements, patterns and discoveries

Browse all 118 elements below, or open your class’s Chemistry pathway.

Class 8 chemistry →Class 9 chemistry →Class 10 chemistry →

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 →

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.

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Different elements.
Repeating patterns.

Discover periodicity

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.

The periodic table