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Arsenic (As), atomic number 33, is a toxic metalloid used in semiconductors and specialised materials. Learn its properties, compounds, isotopes and safety....

Germanium (Ge), atomic number 32, is a brittle semiconductor metalloid used in infrared optics, fiber optics and high-speed electronics. Learn its properties and isotopes....

Gallium (Ga), atomic number 31, is a soft metal that melts near room temperature and is vital in semiconductors such as GaAs and GaN. Learn its properties and uses....

Copper (Cu), atomic number 29, is a highly conductive reddish transition metal used in wiring, plumbing and alloys. Learn its properties, compounds and isotopes....

Nickel (Ni), atomic number 28, is a corrosion-resistant magnetic transition metal used in stainless steel, alloys and batteries. Learn its properties and uses....

Cobalt (Co), atomic number 27, is a magnetic transition metal used in superalloys, batteries and pigments. Learn its properties, compounds, uses and isotopes....

Iron (Fe), atomic number 26, is a magnetic transition metal central to steel, industry and biology. Learn its properties, compounds, uses, isotopes and safety....

Manganese (Mn), atomic number 25, is a hard transition metal essential in steelmaking and biology. Learn its properties, compounds, uses, isotopes and safety....

Chromium (Cr), atomic number 24, is a hard transition metal used in stainless steel and plating. Learn its properties, oxidation states, compounds, uses and safety....

Vanadium (V), atomic number 23, is a transition metal used mainly to strengthen steel. Learn its properties, compounds, oxidation states, uses, isotopes and safety....

Titanium (Ti), atomic number 22, is a strong, light and corrosion-resistant transition metal. Learn its properties, alloys, compounds, uses, isotopes and safety....

Scandium (Sc), atomic number 21, is a light transition metal used in aluminium alloys and special lamps. Learn its properties, compounds, uses and isotopes....

Argon (Ar), atomic number 18, is an inert noble gas used in welding, lighting and controlled atmospheres. Learn its properties, uses, isotopes and history....

Chlorine (Cl), atomic number 17, is a reactive halogen gas. Learn its properties, compounds, water-disinfection uses, isotopes, biological role and safety....

Sulfur (S), atomic number 16, is a yellow group 16 nonmetal essential to life and industry. Learn its properties, compounds, uses, isotopes and safety....

Phosphorus (P), atomic number 15, is a reactive group 15 nonmetal essential to DNA, ATP and bones. Learn its allotropes, properties, compounds, uses and isotopes....

Silicon (Si), atomic number 14, is a group 14 metalloid and semiconductor. Learn its properties, compounds, uses, isotopes, history and safety....

Aluminium (Al), atomic number 13, is a lightweight group 13 metal. Learn its properties, electron configuration, compounds, uses, isotopes and history....