Unsur periode 4
caption: Kalium
caption: Kalsium
caption: Skandium
caption: Titanium
caption: Vanadium
caption: Kromium
caption: Mangan
caption: Besi
caption: Kobalt
caption: Nikel
caption: Tembaga
caption: Seng
caption: Galium
caption: Germanium
caption: Arsenik
caption: Selenium
caption: Bromin
caption: Kripton