Period (periodic table) facts for kids

A period in the periodic table is any horizontal row of elements.

The elements in a certain period all increase one by one in atomic numbers. The elements in the same period are very metallic on the left, and nonmetallic on the right. As you go across a period towards the right, the size of the atom gets larger, because protons and electrons are increasing.

First period has 2 elements. Second period and third period each has 8 elements. Fourth period and fifth period each has 18 elements . And sixth period and seventh period each has 32 elements. Moreover, f-block elements are counted in the sixth and seventh periods. Hence, each one has 32 elements in it.

Standard periodic table

Chemical Series of the Periodic Table

State at standard temperature and pressure. The color of the number (atomic number) above the element symbol shows the state of the element at normal conditions.

• those in blue are gases
• those in green are liquids
• those in black are solid

Images for kids

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  From left to right, aqueous solutions of: Co(NO3)2 (red); K2Cr2O7 (orange); K2CrO4 (yellow); NiCl2 (green); CuSO4 (blue); KMnO4 (purple).