Strontium was discovered by William Cruickshank in 1787. Strontium is a chemical element with symbol Sr and atomic number 38. Strontium is a soft silver-white or...
Rubidium was discovered by Robert Bunsen and Gustav Kirchhoff in 1861. Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft,...
Krypton was discovered and first isolated by William Ramsay and Morris Travers in 1898. Krypton is a chemical element with symbol Kr and atomic number 36....
Bromine was discovered and first isolated by Antoine Jérôme Balard and Leopold Gmelin in 1825. Bromine is a chemical element with symbol Br and atomic number...
Selenium was discovered and first isolated by Jöns Jakob Berzelius and Johann Gottlieb Gahn in 1817. Selenium is a chemical element with symbol Se and atomic number...
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals and also as a pure elemental crystal. The main use...
Germanium was discovered by Clemens Winkler in 1886. Germanium is a chemical element with symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white...
Gallium was discovered by Lecoq de Boisbaudran in 1875. Gallium is a chemical element with symbol Ga and atomic number 31. Gallium does not occur as a...
Zinc was discovered by Indian metallurgists before 1000 BC. Zinc is a chemical element with symbol Zn and atomic number 30. In some respects zinc is chemically...
Copper is a chemical element with symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper...