Sulfur exists in two allotropic forms. Allotropes are forms of an element with different physical and chemical properties. The two forms of sulfur are known as Î±-form and Î²-form (the Greek letters alpha and beta, respectively).
National Organizations American Psychological Association (APA) The American Psychological Association (APA) is located in Washington, D.C., and is the largest scientific and professional organization representing psychology in the United States. APA was founded at the turn of the 20th century, and is the world's largest association of psychologists. APA - Division 16 - Division of School Psychology
The APA, known as the American Psychological Association, is the largest professional organization that represents psychologists. It has a membership of more than 130,000. Psychologists belong to APA in order to identify with, support and advance psychology.The American Psychological Association advocates for the field and offers you direct benefits to meet your professional needs. The APA is largely made up of research psychologists. 2  Membership in the organization is not limited to scientists or clinicians and also includes consultants, educators and psychology students. 3  It is active in development and promotion of quality standards in professional training and practice.