Thus by 1803 there were two known rare earth elements, yttrium and cerium, although it took another 30 years for researchers to determine that other elements were contained in the two ores ceria and yttria (the similarity of the rare earth metals' chemical properties made their separation difficult).
For instance, students who pursue a Ph.D. in psychology usually take from five to seven years depending upon required coursework as well as internship and supervised residency requirements.
The Path to Becoming a Psychologist. First, you will need a bachelor's degree (4 to 5 years), which teaches the fundamentals of psychology. After that, you will need a master's degree (2 to 3 years), which can qualify you to practice in the field as a case manager, employment specialist, or social worker.Then, most state licensing boards require a doctorate (4 to 7 years).The type of doctoral degree you chooseââeither a Doctor of Psychology (PsyD) or Doctor of Philosophy in Psychology (PhD)ââwill depend on your career goals. Many states also require post-doctoral training equivalent to about 1 year of work.hen, most state licensing boards require a doctorate (4 to 7 years). The type of doctoral degree you chooseââeither a Doctor of Psychology (PsyD) or Doctor of Philosophy in Psychology (PhD)ââwill depend on your career goals. Many states also require post-doctoral training equivalent to about 1 year of work.