â George Mandler has described the origins of cognitive psychology in, Ulric Neisser is credited with formally having coined the term cognitive(2002). psychology (in terms of the current understanding of cognitive psychology) in his book Cognitive Psychology, published in 1967.
The melting point of fluorine is -219 Â°C (-363 Â°F). The boiling point of fluorine is -188 Â°C (-307 Â°F).
The atomic number of fluorine is nine, and it has seven valence electrons in its outermost shell. It has 10 neutrons in the nucleus. The electronic configuration of fluorine is [He] 2s^2 2p^5. Fluorine is placed in the second period and group 17 of the periodic table of elements.