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
Psi Chi is one of the largest honor societies in the United States, having more than 1,100 chapters. Psi Chi has inducted more than 700,000 lifetime members from chapters in the United States, Canada, and multiple other countries. Notable past and present members of the organization include B.F. Skinner, Philip Zimbardo, Jon Stewart, and Dr. Phil. Psi Chi is a member of the Association of College Honor Societies and is an affiliate of the American Psychological Association (APA) and the Association for Psychological Science (APS).