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
Health Care Professionals. A psychologist is someone who studies the mind and behavior. While people often think of talk therapy when they hear the word psychologist, this profession actually encompasses a wide range of specialty areas including such things as animal research and organizational behavior.