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The fourth and fifth periods are the medium periods. Each of these periods contains 18 elements. [Pg.34]

In this period, the valence electrons of the elements may be in 4s, 3d or 4p orbitals. This period starts with potassium (K) and ends with krypton (Kr). [Pg.34]

See other pages where The Medium Periods is mentioned: [Pg.34] [Pg.126]