Hektoen International

A Journal of Medical Humanities

Tag: Daniel Rutherford

  • The periodic table of the elements

    In this system hydrogen is assigned the number one, lithium is three, carbon six, nitrogen seven, oxygen eight, etc. The elements are organized in rows or periods and columns or groups according to their atomic weight. The elements were discovered beginning in the 18th century when the Swedish chemist Carl Wilhelm Scheele discovered oxygen (1772),…